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SILCA Valve Extenders...
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Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
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Completely overthought, over engineered and over-built......and I say all that as a compliment.

Well done, Josh.

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Re: SILCA Valve Extenders... [Power13] [ In reply to ]
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Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
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Thanks everybody! This one was a long time coming and as with most products, seems so simple and yet nearly killed me trying to get it just right.

The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people compared to most baseline setups, also it was seen in the tunnel (not my test, done by a company testing these for potential OEM use) over a 3 run average that the ribbed extender seemed to reduce drag and wattage to spin ever so slightly compared to a smooth extension...not selling on aero side-effects just yet, but seems likely.

As a blatant plug, please be sure to tell your local tri/bike shop how necessary this invention is!

Thanks to all, as with many ideas, this one was very much inspired by issues voiced on ST.
J

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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joshatsilca wrote:
The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people.
J

Hey Josh. What sizes would you recommend for a Flo 60 and a Flo 90, both with a 51mm RVC tube?

I've done the math and just figured it wouldn't hurt to double check before completing my purchase.

Scott
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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I'm a fan of all things overthought, overengineered, and overbuilt... but sadly these didn't work with my Zipp 404 and Vittoria Latex 51mm stem combo :-/


Last edited by: cmeeks: Jul 7, 14 16:40
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Re: SILCA Valve Extenders... [cmeeks] [ In reply to ]
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What size did you use on your 404's?

I want to use these on my 808's with the same 51mm vittoria latex tubes.

Josh, Any idea if I could get these to work properly in that setup and if so what size extender?
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Re: SILCA Valve Extenders... [cmeeks] [ In reply to ]
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51mm tubes have really complicated things as they put the valve threads more or less at the inner edge of rims in the 55-60mm range. 32, 37 and 42mm tubes are by far the most common and we have solutions that will work with any of those on rims at this depth. On the upside, the rubber sleeves are more aero than smooth, they will damp noise even if they don't eliminate it and they look awesome on your wheels, but as you can see in the picture, the flats and threads on the bottom of the extension are in the rim hole where you would want the gasket to be and the threads are about 2mm below that because the valve is just too long.

We are working on a cross-reference guide to help with this, but it has been incredibly difficult to get actual valve stem lengths from everybody as well as tire well depths from the wheel manufacturers..but we will get there.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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I had been wondering about the possibility of cutting the Vittoria 51mm valve stem down and then using a tap to rethread the shorter stem for the RVC (This was for more clearance on my Zipp disc). When I went looking for RVC threading info I couldn't find a clear answer on diam, thread count, etc. I'm sure you have this worked out. Are there taps available on the market for this spec or are is this something totally custom?

A second question for you Josh. I couldn't find a contact link on your Silca page. Can you offer the Silca CO2 valve as a standalone item w/o the CO2's for those of us that live where they can't be easily shipped?

Thanks
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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Ircanuck, I used the 34mm RVC extension. As Josh said, it's not so much a problem with the valve extender, the 51mm stem is just too long. The interface between the valve stem and the extender is almost at the rim. You shouldn't have any issues on your 808's. The real problem is the lack of latex tubes with shorter valve stems and a removable valve core. Perhaps SILCA could get into making latex tubes???

Here are the latex RVC tubes I know of (clue me in on any others):
Challenge - 47.5mm
Vittoria - 51mm
Bontrager - 51mm
Vredestein - 52mm
Last edited by: cmeeks: Jul 8, 14 4:55
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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Josh, are your new extenders for removable valve core tubes?
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Re: SILCA Valve Extenders... [SummitAK] [ In reply to ]
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Thanks Summit!
There is not such thing as a commercially available tap for the internal Presta thread, at least not that we've ever found, we have to have ours custom made.
Please email us at sales@silca.cc we for your other question, we have a solution for those outside the Continental boundaries!
Best
Josh

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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Hi Josh,

For latex tubes users with 404 / Enve 6 / Het Stinger or Jet 6 and so on the problem is that if you want to use latex tubes you have a choice between Michelin tubes without removable cores or Vittoria / Bontrager / Vredestein tubes which are all 51mm with removable cores. I don't know of any option for a latex tube with a shorter valve lenght and removable core, do you ?

Not your fault at all... but just wanted to let you know you might face this situation with latex tube users on intermediate depth rims... maybe you need to offer a super high quality Silca latex tube ? :-)
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Re: SILCA Valve Extenders... [cmeeks] [ In reply to ]
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Thanks everybody for the info..this is something we are working on but don't have a solution for at the moment for these longer valve stem on mid depth wheels.

DamonHenry: we make both RVC and standard extensions.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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Is the threading 10-40? I measured out the valve treading and it appears to be 40tpi, but I am unsure if it is size 10.
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Re: SILCA Valve Extenders... [Chris10] [ In reply to ]
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I can't remember the diameter callout, but it's a BSC profile thread so the major/minor diameters don't quite line up with anything standard. There is also a critical taper in the few mm below the thread which is necessary to seal the valve core. We use a custom pre-drill followed by a custom bottoming tap so as not to risk scoring the sealing surface.
J

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [cmeeks] [ In reply to ]
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Is the air seal better? I think $34 is worth it just for that (even if I run 60s with latex tubes).
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Re: SILCA Valve Extenders... [BrentwoodTriGuy] [ In reply to ]
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We use a thread-seal coating on all threads of the extensions. The RVC extensions get a clear coating that is about the viscosity of acetone, a tiny dropper drops it on and it wicks around like magic..pretty cool stuff. That in combination with the rubber seal makes the RVC version completely bullet-proof. On the tube type universal extensions, we use a high viscosity white thread-seal which is quite similar to Teflon tape, but we apply it as a liquid so that the inner thread is fully coated. We also have little custom sized O-rings that drop over the presta valve before you install the RVC..sort of a belt+suspenders approach to the problem, but between the two, they cannot leak, and they will not loosen up over time.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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joshatsilca wrote:
We use a thread-seal coating on all threads of the extensions. The RVC extensions get a clear coating that is about the viscosity of acetone, a tiny dropper drops it on and it wicks around like magic..pretty cool stuff. That in combination with the rubber seal makes the RVC version completely bullet-proof. On the tube type universal extensions, we use a high viscosity white thread-seal which is quite similar to Teflon tape, but we apply it as a liquid so that the inner thread is fully coated. We also have little custom sized O-rings that drop over the presta valve before you install the RVC..sort of a belt+suspenders approach to the problem, but between the two, they cannot leak, and they will not loosen up over time.

I asked a fellow member so it wasn't coming from someone who profits off the product... but with that said, you fully back it money back guarantee?
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Re: SILCA Valve Extenders... [pyf] [ In reply to ]
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I'm in the 'tweener' with these extensions as well. I'd gladly pay $34 for either RVC or regular extensions to cure the rattling on my Enve 45s, but I too use Victoria Latex tubes and looks like the anti-rattling material would be at the same height as the 404s pictured above.
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Re: SILCA Valve Extenders... [BrentwoodTriGuy] [ In reply to ]
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BrentwoodTriGuy wrote:
I asked a fellow member so it wasn't coming from someone who profits off the product... but with that said, you fully back it money back guarantee?

FFS, What a shitty thing to type out. You having a bad day or something?
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Re: SILCA Valve Extenders... [Pantelones] [ In reply to ]
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Pantelones wrote:
BrentwoodTriGuy wrote:
I asked a fellow member so it wasn't coming from someone who profits off the product... but with that said, you fully back it money back guarantee?

FFS, What a shitty thing to type out. You having a bad day or something?

Not at all and I don't think it's shitty either. It's biased information. So what I said is fair.

Shitty would be pointing out that he claimed (prior to this thread) that his extender dampened noise but actually doesn't on some.
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Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
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any UK stockists ? - cant seem to find any at moment.,
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Re: SILCA Valve Extenders... [big_vern] [ In reply to ]
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We will have a UK stockiest here in the next 2 months as floor pumps become available..we will post on the site as they receive stock.

As for fitment, I'm working on a diagram and incorporating actual measurements from various companies both rims and valves, but we have a verbal description of measurement on our site now on the extension page.

For Brentwood, you can sleep soundly knowing that the gasket damps sound even when not in the ideal location..but yes, matching the size of the extension to the valve and the rim is critical for getting the gasket right at the hole edge, and in the case of 51 or 60mm valves on rims 60mm and shallower, there just isn't anywhere on the extension that the gasket can physically exist due to geometry of the thread interface. However, we can and do guarantee the air tightness of the extension..which is not easy considering the massive variance in styles, designs, and tolerances of valve stems on the market. We are the only extension that I know of using pre-applied sealants, and we also include o-ring seals specifically designed for the extension/stem interface..so they are completely air-tight, every time, guaranteed..and I don't know of anybody who can or will say that about any similar product.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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joshatsilca wrote:
51mm tubes have really complicated things as they put the valve threads more or less at the inner edge of rims in the 55-60mm range. 32, 37 and 42mm tubes are by far the most common and we have solutions that will work with any of those on rims at this depth. On the upside, the rubber sleeves are more aero than smooth, they will damp noise even if they don't eliminate it and they look awesome on your wheels, but as you can see in the picture, the flats and threads on the bottom of the extension are in the rim hole where you would want the gasket to be and the threads are about 2mm below that because the valve is just too long.

We are working on a cross-reference guide to help with this, but it has been incredibly difficult to get actual valve stem lengths from everybody as well as tire well depths from the wheel manufacturers..but we will get there.

Ugh. This would have been good to know before placing my order (below).

GreatScott wrote:
joshatsilca wrote:
The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people.
J

Hey Josh. What sizes would you recommend for a Flo 60 and a Flo 90, both with a 51mm RVC tube?

I've done the math and just figured it wouldn't hurt to double check before completing my purchase.

Scott
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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joshatsilca wrote:

For Brentwood, you can sleep soundly knowing that the gasket damps sound even when not in the ideal location..but yes, matching the size of the extension to the valve and the rim is critical for getting the gasket right at the hole edge, and in the case of 51 or 60mm valves on rims 60mm and shallower, there just isn't anywhere on the extension that the gasket can physically exist due to geometry of the thread interface. However, we can and do guarantee the air tightness of the extension..which is not easy considering the massive variance in styles, designs, and tolerances of valve stems on the market. We are the only extension that I know of using pre-applied sealants, and we also include o-ring seals specifically designed for the extension/stem interface..so they are completely air-tight, every time, guaranteed..and I don't know of anybody who can or will say that about any similar product.


FWIW... I could care less about the noise... I've never noticed it on my bike.

And a guarantee still isn't a money back guarantee. I'm happy to pay $34 just for the air sealant... but I am not okay with forking over $34 for something I have 5 of and get free from my mechanic.

https://www.youtube.com/watch?v=a5dpBpaFiMo
Last edited by: BrentwoodTriGuy: Jul 10, 14 17:59
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Re: SILCA Valve Extenders... [BrentwoodTriGuy] [ In reply to ]
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So the problem with 'money back guarantee' is that nobody learns anything in the process associated with that sales tactic. This works great for companies who have tons some product to shill on late night TV and need to lower the perceived risk of the consumer. So if you are selling GeneriClean on late night TV, you offer 'money back guarantee' to get people to try it, and if they really hate it, they get their money back and you keep focusing on selling the million gallons of GeneriClean that you have coming ashore on container ships from China.. and best of all, you just have to sell it at a price that can absorb the % of people who successfully get their refund.

In my world, our goal is 0% problems/issues/refunds, but the only way we get there is by learning from each other and improving the product as we go. I'm not shilling the million valve extensions on a container from China, I'm making and assembling them myself (with 2 employees) one at a time. So if I'm selling valve extenders which have worked well for the first 200 people and they don't work for you, then I need to start working through a fairly specific process to figure out why so that either we can improve our part, we can improve the information for consumers about our part, or we can isolate problematic combinations with other parts and try to address them, whether it be with our product or with the ill-mating product. So to me, 'Money back guarantee' means, 'nobody learns anything and nothing improves', and that doesn't work for me. In fact, what we offer, is more me putting my most valuable people on your problem for signifigant periods of time, pay shipping both ways, replace product at our cost, work with you personally, work with your mechanic or shop..all at no cost to you so that the problem can be SOLVED, not just band-aided by the revenue of additional sales to people who feel their purchase is less risky because they can get their money back.

So ultimately, what we offer our customers is that we will spend many times the purchase price of your product in our time, money and product in order to not only understand and solve the problem, but to make sure others don't have that same problem, and to make future products better both ours, and the mating products. However, our way does involve the participation of the consumer, and if our customer isn't interested in participating in that process, then it doesn't work for either of us.

So like I said initially, we make stuff that works, it works really well, but like anything designed or made by anybody, it cannot yet be perfect, and it can certainly be designed or made better. So if our stuff doesn't work for you, then we need to work with you to determine why, and we do what is needed to make it right both in the short term, and in the long term through improving future generations of the product.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [GreatScott] [ In reply to ]
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GreatScott wrote:
joshatsilca wrote:
51mm tubes have really complicated things as they put the valve threads more or less at the inner edge of rims in the 55-60mm range. 32, 37 and 42mm tubes are by far the most common and we have solutions that will work with any of those on rims at this depth. On the upside, the rubber sleeves are more aero than smooth, they will damp noise even if they don't eliminate it and they look awesome on your wheels, but as you can see in the picture, the flats and threads on the bottom of the extension are in the rim hole where you would want the gasket to be and the threads are about 2mm below that because the valve is just too long.

We are working on a cross-reference guide to help with this, but it has been incredibly difficult to get actual valve stem lengths from everybody as well as tire well depths from the wheel manufacturers..but we will get there.


Ugh. This would have been good to know before placing my order (below).

GreatScott wrote:
joshatsilca wrote:
The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people.
J


Hey Josh. What sizes would you recommend for a Flo 60 and a Flo 90, both with a 51mm RVC tube?

I've done the math and just figured it wouldn't hurt to double check before completing my purchase.

Scott

I'm hoping to finish up some testing with our 60 and 90 tomorrow. I'll let you know how that goes.

Take care,


Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling
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Re: SILCA Valve Extenders... [ In reply to ]
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Just got my extenders. Tried on a Hed JET 5 with a 48mm bontrager tube and it's too long to hit the rubber/dampening material.

I wanted to try to standardize all the tubes, but might have to consider keeping two tube sizes around. I will say the sealant makes for a reassuring hold and seal.
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Re: SILCA Valve Extenders... [BrentwoodTriGuy] [ In reply to ]
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BrentwoodTriGuy wrote:
Is the air seal better? I think $34 is worth it just for that (even if I run 60s with latex tubes).



BrentwoodTriGuy wrote:
joshatsilca wrote:
We use a thread-seal coating on all threads of the extensions. The RVC extensions get a clear coating that is about the viscosity of acetone, a tiny dropper drops it on and it wicks around like magic..pretty cool stuff. That in combination with the rubber seal makes the RVC version completely bullet-proof. On the tube type universal extensions, we use a high viscosity white thread-seal which is quite similar to Teflon tape, but we apply it as a liquid so that the inner thread is fully coated. We also have little custom sized O-rings that drop over the presta valve before you install the RVC..sort of a belt+suspenders approach to the problem, but between the two, they cannot leak, and they will not loosen up over time.


I asked a fellow member so it wasn't coming from someone who profits off the product...


Do we have "user conformation" on the air tightness of the extenders? I have a leaky valve that is driving me crazy and remain hopeful in this solution. Do I make a change two weeks before IMC?

Scott
Last edited by: GreatScott: Jul 12, 14 12:11
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Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
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Canadian wrote:
GreatScott wrote:
joshatsilca wrote:
51mm tubes have really complicated things as they put the valve threads more or less at the inner edge of rims in the 55-60mm range. 32, 37 and 42mm tubes are by far the most common and we have solutions that will work with any of those on rims at this depth. On the upside, the rubber sleeves are more aero than smooth, they will damp noise even if they don't eliminate it and they look awesome on your wheels, but as you can see in the picture, the flats and threads on the bottom of the extension are in the rim hole where you would want the gasket to be and the threads are about 2mm below that because the valve is just too long.

We are working on a cross-reference guide to help with this, but it has been incredibly difficult to get actual valve stem lengths from everybody as well as tire well depths from the wheel manufacturers..but we will get there.


Ugh. This would have been good to know before placing my order (below).

GreatScott wrote:
joshatsilca wrote:
The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people.
J


Hey Josh. What sizes would you recommend for a Flo 60 and a Flo 90, both with a 51mm RVC tube?

I've done the math and just figured it wouldn't hurt to double check before completing my purchase.

Scott

I'm hoping to finish up some testing with our 60 and 90 tomorrow. I'll let you know how that goes.

Take care,

Howdy Chris,

Thanks for chiming in. Just another example of why Flo rocks. Any results from Flo's Myth Buster Lab?

Scott
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Re: SILCA Valve Extenders... [GreatScott] [ In reply to ]
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GreatScott wrote:
Canadian wrote:
GreatScott wrote:
joshatsilca wrote:
51mm tubes have really complicated things as they put the valve threads more or less at the inner edge of rims in the 55-60mm range. 32, 37 and 42mm tubes are by far the most common and we have solutions that will work with any of those on rims at this depth. On the upside, the rubber sleeves are more aero than smooth, they will damp noise even if they don't eliminate it and they look awesome on your wheels, but as you can see in the picture, the flats and threads on the bottom of the extension are in the rim hole where you would want the gasket to be and the threads are about 2mm below that because the valve is just too long.

We are working on a cross-reference guide to help with this, but it has been incredibly difficult to get actual valve stem lengths from everybody as well as tire well depths from the wheel manufacturers..but we will get there.


Ugh. This would have been good to know before placing my order (below).

GreatScott wrote:
joshatsilca wrote:
The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people.
J


Hey Josh. What sizes would you recommend for a Flo 60 and a Flo 90, both with a 51mm RVC tube?

I've done the math and just figured it wouldn't hurt to double check before completing my purchase.

Scott


I'm hoping to finish up some testing with our 60 and 90 tomorrow. I'll let you know how that goes.

Take care,


Howdy Chris,

Thanks for chiming in. Just another example of why Flo rocks. Any results from Flo's Myth Buster Lab?

Scott

The only tubes I was able to source locally were the 48mm version. Unfortunately the 45mm Silca extender is a tad bit too long to work with our FLO 60 but the 60mm Silca extender works perfectly with our FLO 90. From my discussions with Josh, a 37mm tube will work perfectly with a 45mm extender and a FLO 60. My sources simply didn't carry that length. I'm chatting with Josh behind the scenes to try and find a better answer. I want to be able to recommend one tube length that works with a specific Silca extender for both our FLO 60 and 90.

Beside the minor fit issue we are dealing with, I have to say I'm really impressed with the product. Wrapping plumbers tape on your extenders isn't the end of the world, but it's a step that shouldn't need to be taken. Josh's design is really effective. After your rubber washer is installed (which is easy to do), you simply screw the extender on. They hold air really well too.

It's one of those products you use where you say... "that's how it was supposed to be done" OR "why didn't anyone else think of this?".

I hope that helps,


Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling
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Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
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So if I am measuring a tube, where do I measure to get the "length? I want shorter stuff, like the 32, but want to make sure what I have already.

.

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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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Hey Josh,
So it sounds like, if you are using 404 clinchers and most latex tubes (which seem to have valve stems ranging from 47.5-52mm) these wont quite work as would be ideal (I think pyf asked the same question). Seems like that combination could represent a pretty big percentage of potential buyers no?
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Re: SILCA Valve Extenders... [h2ofun] [ In reply to ]
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h2ofun wrote:
So if I am measuring a tube, where do I measure to get the "length? I want shorter stuff, like the 32, but want to make sure what I have already.

.

The tube length should be stated on the box the tube comes in. Do you still have the box?


Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling
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Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
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Thanks for the feedback. I love that Flo and Silca are working together to integrate the products. We all win with that approach!

Ps - I'm following the "new product thread" and look forward to seeing the latest and greatest innovation from Flo.

Scott
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Re: SILCA Valve Extenders... [ollie3856] [ In reply to ]
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Really good stuff on this thread everybody! Thanks to Canadian for chiming in with his experience..very exciting for us to be working with FLO, those guys are just really great guys, and are both fun and inspiring to work with!

pyf, yes, that represents a percentage for sure, but if any history of valve stem length is any indication it won't last long. 51 is a pretty recent development in this space and causes it's own issues by being usually long enough for 45mm rims (though not always), yet not long enough for equally common 50mm rims so I won't be surprised if it's different next year.

I like to think of our valve extension as being say 150% the functionality of a normal extension wth 100% being that it effectively makes the valve longer, and give us say 25% for having best in class seal effectiveness which is pre-applied. Then maybe another 25% for the anti-rattle gasket...which will reduce noise even if the gasket isn't exactly in the valve hole as it will damp vibrations making the valve stem less effective at making as much noise. So even in the case of 51mm stems and 60mm rims, we still represent (IMO) ~125% effectiveness of a normal extension in terms of effectiveness and value. Of course different people place different value on different features, and I regularly talk to people on both sides of the issue.

In the particular case of the 51mm stem and 60mm rim, the limitation is a one. Since a general clincher rim tire well is 8-9mm deep, so on a 60mm rim, the distance between the tire well and rim surface is ~51-52mm , so that locates the valve core threads right in the zone where we want the gasket. So since the valve core threads have a major diameter of 5mm and most rim holes are 6.25mm, there just isn't enough physical space to have both a sufficient amount of aluminum AND a gasket.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
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Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
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I'm a fan regardless. One other piece of feedback, the rubber 'anti-rattle' part gets pushed down on the extender pretty badly using the Silca stainless presta head, I suspect a few more attempts and it could easily tear/rip that rubber, any thoughts/suggestions on how to avoid that?

Thanks!
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Re: SILCA Valve Extenders... [ollie3856] [ In reply to ]
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Thanks Ollie,
You shouldn't have to push your 17-4 on that far, it is fully engaged on both gasket seal surfaces when the chuck is 2mm above the top edge of the gasket, so no need to push on any further.
This is a great piece of feedback and something we'll look further into for future generations..thanks!



http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
Quote | Reply
I still use the old school Zipp extenders that you simply screw onto the valve stem, no threads on the end of the extender. Do many of you still use these.

Barry Dmitruk
2017: Florida 70.3 (done); Mont Tremblant 70.3 & Ironman


Quote Reply
Re: SILCA Valve Extenders... [konaexpress] [ In reply to ]
Quote | Reply
I don't. I could never get a good pressure on them and had issues with leaks.

I switched to Vittoria extenders on removal core tubes and they worked fine. I have a sense the Silca's will work much better.

r
Quote Reply
Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
Quote | Reply
Macho Grande wrote:
I don't. I could never get a good pressure on them and had issues with leaks.

I switched to Vittoria extenders on removal core tubes and they worked fine. I have a sense the Silca's will work much better.

r

I concur. I had the SRAM Valve Extenders and always struggled to inflate my tires. I would be sweating trying to inflate my tires before I even hit the open roads. I switched to a removable core. I will most likely be moving to SILCA once the calculations are determined for my S80's.
Quote Reply
Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
Quote | Reply
I have been using the Zipp extenders since 1995 and have never had trouble filling up a tire/tubular or retaining air. I think teflon tape is a big reason why. I guess if it ain't broken don't fix it.

Barry Dmitruk
2017: Florida 70.3 (done); Mont Tremblant 70.3 & Ironman


Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
So when will your new floor pump be available? That is what i am really waiting for...
Quote Reply
Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
Quote | Reply
Macho Grande wrote:
I don't. I could never get a good pressure on them and had issues with leaks.

I switched to Vittoria extenders on removal core tubes and they worked fine. I have a sense the Silca's will work much better.

r

I had no issues for years, but had the same issue with my first race this year. Went with the zipp having some thread type stuff at the end and now seems okay
with filling.

.

Dave Campbell | Facebook | @DaveECampbell | h2ofun@h2ofun.net

Boom Nutrition code 19F4Y3 $5 off 24 pack box | Bionic Runner | PowerCranks | Velotron | Spruzzamist

Lions don't lose sleep worrying about the sheep
Quote Reply
Re: SILCA Valve Extenders... [konaexpress] [ In reply to ]
Quote | Reply
konaexpress wrote:
I have been using the Zipp extenders since 1995 and have never had trouble filling up a tire/tubular or retaining air. I think teflon tape is a big reason why. I guess if it ain't broken don't fix it.

Yes, this.
I only have the one wheel that needs an extender, the F (use a disc cover on R, so regular stem back there), and on both my older 404, and current Jet90, I use the plain old straight extender, attached w/ teflon tape, and have had no issues ever with inflation or holding air.


float , hammer , and jog

Quote Reply
Re: SILCA Valve Extenders... [Murphy'sLaw] [ In reply to ]
Quote | Reply
Murphy'sLaw wrote:
konaexpress wrote:
I have been using the Zipp extenders since 1995 and have never had trouble filling up a tire/tubular or retaining air. I think teflon tape is a big reason why. I guess if it ain't broken don't fix it.


Yes, this.
I only have the one wheel that needs an extender, the F (use a disc cover on R, so regular stem back there), and on both my older 404, and current Jet90, I use the plain old straight extender, attached w/ teflon tape, and have had no issues ever with inflation or holding air.

You never have had an issue with a bike pump at the end? I had not for years and this year I could never get them to seal, or my LBS.

.

Dave Campbell | Facebook | @DaveECampbell | h2ofun@h2ofun.net

Boom Nutrition code 19F4Y3 $5 off 24 pack box | Bionic Runner | PowerCranks | Velotron | Spruzzamist

Lions don't lose sleep worrying about the sheep
Quote Reply
Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
Quote | Reply
Canadian wrote:
GreatScott wrote:
Canadian wrote:
GreatScott wrote:
joshatsilca wrote:
51mm tubes have really complicated things as they put the valve threads more or less at the inner edge of rims in the 55-60mm range. 32, 37 and 42mm tubes are by far the most common and we have solutions that will work with any of those on rims at this depth. On the upside, the rubber sleeves are more aero than smooth, they will damp noise even if they don't eliminate it and they look awesome on your wheels, but as you can see in the picture, the flats and threads on the bottom of the extension are in the rim hole where you would want the gasket to be and the threads are about 2mm below that because the valve is just too long.

We are working on a cross-reference guide to help with this, but it has been incredibly difficult to get actual valve stem lengths from everybody as well as tire well depths from the wheel manufacturers..but we will get there.


Ugh. This would have been good to know before placing my order (below).

GreatScott wrote:
joshatsilca wrote:
The very cool side effect of these extensions is that you have to size them correctly, and when you do, you only have as much valve protruding as you need..so there is a very real aero benefit for most people.
J


Hey Josh. What sizes would you recommend for a Flo 60 and a Flo 90, both with a 51mm RVC tube?

I've done the math and just figured it wouldn't hurt to double check before completing my purchase.

Scott


I'm hoping to finish up some testing with our 60 and 90 tomorrow. I'll let you know how that goes.

Take care,


Howdy Chris,

Thanks for chiming in. Just another example of why Flo rocks. Any results from Flo's Myth Buster Lab?

Scott

The only tubes I was able to source locally were the 48mm version. Unfortunately the 45mm Silca extender is a tad bit too long to work with our FLO 60 but the 60mm Silca extender works perfectly with our FLO 90. From my discussions with Josh, a 37mm tube will work perfectly with a 45mm extender and a FLO 60. My sources simply didn't carry that length. I'm chatting with Josh behind the scenes to try and find a better answer. I want to be able to recommend one tube length that works with a specific Silca extender for both our FLO 60 and 90.

Beside the minor fit issue we are dealing with, I have to say I'm really impressed with the product. Wrapping plumbers tape on your extenders isn't the end of the world, but it's a step that shouldn't need to be taken. Josh's design is really effective. After your rubber washer is installed (which is easy to do), you simply screw the extender on. They hold air really well too.

It's one of those products you use where you say... "that's how it was supposed to be done" OR "why didn't anyone else think of this?".

I hope that helps,

I just installed a 34mm extender on the 51mm stem and am reasonably satisfied with the fit on the Flo 60. Not perfect, but serviceable. I'll report back on whether the valve seal improves retention of tire pressure. I was going crazy losing 30psi / 24 hrs previously. Part of that is the latex tube, but I'm hoping for improvement from the valve.

Scott
Quote Reply
Re: SILCA Valve Extenders... [GreatScott] [ In reply to ]
Quote | Reply
Thanks for the update.


Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling
Quote Reply
Re: SILCA Valve Extenders... [GreatScott] [ In reply to ]
Quote | Reply
Scott, I assume that the gasket is entirely outside of the rim, but can you post a pic to give me an idea of where.

I can guarantee that the stem sealing will improve, but that might not be the issue with your latex tube..they all bleed air, but some worse than others. For our Roubaix preparations with Cancellara and CSC all those years ago we did bleed-down testing on about 50 tires and rated individual tires in psi lost per hour, I can't remember the numbers exactly, but the range went from roughly 1/2psi per hour to 2 or 3 per hour.. Using a sealant helps, we had great luck with the CafeLatex from my good friends at Effeto Mariposa which makes a nice foam in the tire and reduced all of the tire leakdowns quite a bit.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
Just wanted to give a quick shout-out to Josh. Found myself in a bit of situation last night as I was gluing on a new front tire for Racine. The valve externder that I had bought was too short and I didn't want to use the old valve extender that was on there (didn't have the valve at the top).

Ordered new extenders last night and als sent him a PM. Josh called me this AM to review my options and got me squared away.

Thanks, Josh. Mucho appreciated!!!

Chicago Cubs - 2016 WORLD SERIES Champions!!!!

"If ever the time should come, when vain and aspiring men shall possess the highest seats in government, our country will stand in need of its experienced patriots to prevent its ruin." - Samuel Adams
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
joshatsilca wrote:
Scott, I assume that the gasket is entirely outside of the rim, but can you post a pic to give me an idea of where.

I can guarantee that the stem sealing will improve, but that might not be the issue with your latex tube..they all bleed air, but some worse than others. For our Roubaix preparations with Cancellara and CSC all those years ago we did bleed-down testing on about 50 tires and rated individual tires in psi lost per hour, I can't remember the numbers exactly, but the range went from roughly 1/2psi per hour to 2 or 3 per hour.. Using a sealant helps, we had great luck with the CafeLatex from my good friends at Effeto Mariposa which makes a nice foam in the tire and reduced all of the tire leakdowns quite a bit.

I made a quick measurement after installing the extender last night and found about 10mm of gasket above the rim. If my math is right, that leaves 4mm inside the rim. I'll post a pic when I get a chance.

Speaking of sealant, I had trouble getting mine (Flat Attack) through the valve core and extender. I gave up, figuring the intersection of the core and extender was to narrow for the thick liquid. Any recommendations for that issue, other than unwinding the install and going directly into the core?

Scott
Quote Reply
Re: SILCA Valve Extenders... [GreatScott] [ In reply to ]
Quote | Reply
Thanks Power13! I'm happy we could help! I think we've all been in that pinch before, so we do what we can to help.

The thru hole in the RVC extension is as large as it can be and still have ample wall thickness in the thread interface where it meets the valve..which is smaller than the thru hole in the valve. Either way though, you shouldn't have too much trouble getting sealant through it unless the sealant has large fibers or particulates in it..I'm not familiar with flat attack. I use Effetto Mariposa Café Latex with very good results on mine.

I'll buy some Flat Attack and see what's in it. Thanks for the info.

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
GreatScott wrote:
joshatsilca wrote:
Scott, I assume that the gasket is entirely outside of the rim, but can you post a pic to give me an idea of where.

I can guarantee that the stem sealing will improve, but that might not be the issue with your latex tube..they all bleed air, but some worse than others. For our Roubaix preparations with Cancellara and CSC all those years ago we did bleed-down testing on about 50 tires and rated individual tires in psi lost per hour, I can't remember the numbers exactly, but the range went from roughly 1/2psi per hour to 2 or 3 per hour.. Using a sealant helps, we had great luck with the CafeLatex from my good friends at Effeto Mariposa which makes a nice foam in the tire and reduced all of the tire leakdowns quite a bit.


I made a quick measurement after installing the extender last night and found about 10mm of gasket above the rim. If my math is right, that leaves 4mm inside the rim. I'll post a pic when I get a chance.

Speaking of sealant, I had trouble getting mine (Flat Attack) through the valve core and extender. I gave up, figuring the intersection of the core and extender was to narrow for the thick liquid. Any recommendations for that issue, other than unwinding the install and going directly into the core?

Scott


Hi Josh,

Turns out the sealant was just a matter of finding the right applicator. My local drug store has a stash of complimentary syringes generally used for dispensing liquid oral medication. The nozzle on that syringe fit nicely into the valve extender and I was able to inject the Flat Attack without any trouble.

Here is a picture of the 34mm extender on a 51mm Vittoria Latex in a Flo 60:



Nice to have some confidence in the setup heading into IMC next week!

Scott
Last edited by: GreatScott: Jul 21, 14 13:08
Quote Reply
Re: SILCA Valve Extenders... [GreatScott] [ In reply to ]
Quote | Reply
GreatScott,
That's good to hear, and a good recommendation on the medicine syringes. I'll add that one to my list of event hacks!
Thanks for the update
J

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
Hi Josh, any idea if a Michelin latex tube with a length of 36mm inside a Enve 45 (depth 45) would work with your non RVC 45 extender? Thanks!
Quote Reply
Re: SILCA Valve Extenders... [waupaca11] [ In reply to ]
Quote | Reply
Waupaca11,
What you need is a 34mm non-RVC extension, which we didn't make until yesterday. Literally. I've just received them from the anodizer and we will be gasketing/thread-sealing them and packaging over the course of next week. They will be on the market officially by second week of September. We've sized them to be perfect for 45-50mm rims and 36-42mm valve stems.
Here's a prototype on my 45mm 303 with 37mm valve Zipp tube


http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
Awesome! I'll order second week of sept, thanks!
Quote Reply
Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
Quote | Reply
Canadian wrote:
...{CLIP}

The only tubes I was able to source locally were the 48mm version. Unfortunately the 45mm Silca extender is a tad bit too long to work with our FLO 60 but the 60mm Silca extender works perfectly with our FLO 90. From my discussions with Josh, a 37mm tube will work perfectly with a 45mm extender and a FLO 60. My sources simply didn't carry that length. I'm chatting with Josh behind the scenes to try and find a better answer. I want to be able to recommend one tube length that works with a specific Silca extender for both our FLO 60 and 90.

Beside the minor fit issue we are dealing with, I have to say I'm really impressed with the product. Wrapping plumbers tape on your extenders isn't the end of the world, but it's a step that shouldn't need to be taken. Josh's design is really effective. After your rubber washer is installed (which is easy to do), you simply screw the extender on. They hold air really well too.

It's one of those products you use where you say... "that's how it was supposed to be done" OR "why didn't anyone else think of this?".

I hope that helps,

Do you also have a recommendation what will work with one valve length for your disc (no extender) and the corresponding extender for the 60. Note: locally I usually only see 48mm (and up) valve stem tubes as well.
Quote Reply
Re: SILCA Valve Extenders... [J_R] [ In reply to ]
Quote | Reply
The new 34mm Extender will work perfectly with a 48mm stem in a 60mm rim. The 45mm extender works best with 32-42mm stems in that same wheel.
We are working on a chart/database for all of this, but have been a bit slammed with everything else going on and are running behind!
Best
J

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [J_R] [ In reply to ]
Quote | Reply
J_R wrote:
Canadian wrote:
...{CLIP}

The only tubes I was able to source locally were the 48mm version. Unfortunately the 45mm Silca extender is a tad bit too long to work with our FLO 60 but the 60mm Silca extender works perfectly with our FLO 90. From my discussions with Josh, a 37mm tube will work perfectly with a 45mm extender and a FLO 60. My sources simply didn't carry that length. I'm chatting with Josh behind the scenes to try and find a better answer. I want to be able to recommend one tube length that works with a specific Silca extender for both our FLO 60 and 90.

Beside the minor fit issue we are dealing with, I have to say I'm really impressed with the product. Wrapping plumbers tape on your extenders isn't the end of the world, but it's a step that shouldn't need to be taken. Josh's design is really effective. After your rubber washer is installed (which is easy to do), you simply screw the extender on. They hold air really well too.

It's one of those products you use where you say... "that's how it was supposed to be done" OR "why didn't anyone else think of this?".

I hope that helps,


Do you also have a recommendation what will work with one valve length for your disc (no extender) and the corresponding extender for the 60. Note: locally I usually only see 48mm (and up) valve stem tubes as well.


Exactly what Josh said. His 34mm extenders will be our new standard for all of our wheels. It would look like this.

FLO 30: 48mm Tube
FLO 60: 48mm Tube + 34mm Silca Extender
FLO 90: 48mm Tube + 60mm Silca Extender
FLO DISC: 48mm Tube

I hope that helps.

For the record, I'm hearing the 34mm extenders should be available within the month. Josh and can correct me if I'm wrong.


Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling
Last edited by: Canadian: Aug 31, 14 22:32
Quote Reply
Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
Quote | Reply
Canadian wrote:
FLO 30: 48mm Tube
FLO 30: 48mm Tube + 34mm Silca Extender
FLO 90: 48mm Tube + 60mm Silca Extender
FLO DISC: 48mm Tube

I think you meant FLO 60 on the 2nd line there.
Quote Reply
Re: SILCA Valve Extenders... [asad137] [ In reply to ]
Quote | Reply
asad137 wrote:
Canadian wrote:

FLO 30: 48mm Tube
FLO 30: 48mm Tube + 34mm Silca Extender
FLO 90: 48mm Tube + 60mm Silca Extender
FLO DISC: 48mm Tube


I think you meant FLO 60 on the 2nd line there.

Thanks! I definitely did. I just edited my post.


Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling
Quote Reply
Re: SILCA Valve Extenders... [Canadian] [ In reply to ]
Quote | Reply
First ship date for 34mm Extenders will be Sept 16. We are just awaiting packaging, and are currently assembling parts now.
Best
J

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
Josh, I see the RVC 34mm extensions...What about the non RVC in 34mm?

Thanks
Last edited by: waupaca11: Sep 18, 14 21:32
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
joshatsilca wrote:
Waupaca11,
What you need is a 34mm non-RVC extension, which we didn't make until yesterday. Literally. I've just received them from the anodizer and we will be gasketing/thread-sealing them and packaging over the course of next week. They will be on the market officially by second week of September. We've sized them to be perfect for 45-50mm rims and 36-42mm valve stems.
Here's a prototype on my 45mm 303 with 37mm valve Zipp tube

Any eta on when we can see the non RVC in 34mm?

Thanks
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
I have a couple questions I could use help with. I have historically used the zipp extenders with a set of FLO 60/90s. Never had issues, but now I bought a new pump it doesn't seal with the valve extender, and there are no threads to use my crack pipe. So I'm not able to use my wheels!

3 questions for you.
1) can I use a normal floor pump, and co2 flat repair pump, with these?
2) are there issues (aero?) with my valve extender protruding too far from the rim?
3 what do people with a disc do to pump up? Still need a crack pipe or does this alleviate needing to carry one of those around?

Or, I need to buy myself a new pump which is annoying..

Thanks!!
Quote Reply
Re: SILCA Valve Extenders... [mvenneta] [ In reply to ]
Quote | Reply
mvenneta,
Both types of SILCA valve extenders have standard valve core threads on the top, so they will work with any pump or CO2. I think that a lot of people are caught off guard by barb type valve extenders, as many of the modern CO2 inflators will not work at all with them, and so many pumps now use thread on chucks that they will not work either.

There can be an aero penalty for valve extenders protruding too far, but it's pretty small, on the order of 0.05 watt per centimeter of extender protruding, and you typically need at least 12-15mm of exposed valve for most pumps.

People with disc wheels still need an adapter or some sort and generally do not need valve extenders. We strongly advocate for testing your CO2 inflator on both your disc and valve extenders as the side of the road during an Ironman is NOT the place to be figuring it out, and many if not most CO2 inflators will not work with disc wheels or barb type valve extenders.

Josh

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
Would the non rvc extender work with co2? Specifically lezyne if you know?
Quote Reply
Re: SILCA Valve Extenders... [eggplantOG] [ In reply to ]
Quote | Reply
eggplant,

Thanks for asking, YES, our extenders will work with Lezyne CO2 regulators, and in fact work with ALL CO2 regulators. That is something we've been trying to spread the word on as the most heavily sold CO2 regulators (Lezyne and Birzman) require valve threads to operate properly, while the majority of OEM valve extenders ( pre-2014 Zipp, Reynolds and Mavic) are of a barb type that will not work with those regulators.

Josh

http://www.SILCA.cc
Check out my podcast, inside stories from more than 20 years of product and tech innovation from inside the Pro Peloton and Pro Triathlon worlds!
http://www.marginalgainspodcast.cc
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
What size extender do I need for a zipp 808 with a vittoria latex tube? Vittoria says the tube is 51 mm long but I measured it and its really 44 mm. Using 44mm on the chart puts me in between the 45 mm and 60 mm extender. I think the 45 mm extender will work but I just want to confirm. Also, is there any reason to use teflon tape on your extenders?

I'm racing next weekend..... how fast is your shipping? I'm in need of a disc wheel adaptor and just curious if I order today, when can I expect to receive shipment.
Thanks

blog
Quote Reply
Re: SILCA Valve Extenders... [joshatsilca] [ In reply to ]
Quote | Reply
Josh

I am bringing back an old thread. Is it still an issue with the combo of 51mm tubes / Zipp 404 and using the Silca extenders? Or does the 34 RVC solve this issue?

Thanks
Quote Reply
Re: SILCA Valve Extenders... [loosegroove] [ In reply to ]
Quote | Reply
loosegroove wrote:
Is it still an issue with the combo of 51mm tubes / Zipp 404 and using the Silca extenders? Or does the 34 RVC solve this issue?

I have a 34mm RVCs, FC 404s, and Challenge latex tubes (47.5mm) and the rubber piece on the extender does not contact the rim - they rattle around like every other extender.
Quote Reply
Re: SILCA Valve Extenders... [rijndael] [ In reply to ]
Quote | Reply
Thanks for the heads up...a little disappointed. Would you recommend these still over standard extensions?

Thanks
Quote Reply
Re: SILCA Valve Extenders... [loosegroove] [ In reply to ]
Quote | Reply
No.

I used a bit of heat shrink tubing on the Zipp extender as a workaround.
Quote Reply
Re: SILCA Valve Extenders... [rijndael] [ In reply to ]
Quote | Reply
rijndael wrote:
No.

I used a bit of heat shrink tubing on the Zipp extender as a workaround.

Sounds like a solid solution - thanks for the idea and saving me some $
Quote Reply
Re: SILCA Valve Extenders... [loosegroove] [ In reply to ]
Quote | Reply
Anytime.
Quote Reply
Re: SILCA Valve Extenders... [loosegroove] [ In reply to ]
Quote | Reply
You could go with the ENVE versions of the Silca extender. The rubber extends all the way down. I'm using them with Vittoria latex 51mm and the 34mm Enve extender on HED Jet 6.
Quote Reply
Re: SILCA Valve Extenders... [sun] [ In reply to ]
Quote | Reply
sun wrote:
You could go with the ENVE versions of the Silca extender. The rubber extends all the way down. I'm using them with Vittoria latex 51mm and the 34mm Enve extender on HED Jet 6.


I had no idea that was even an option - great find and thank you for the heads up.
Last edited by: loosegroove: Jun 15, 16 7:26
Quote Reply
Re: SILCA Valve Extenders... [Macho Grande] [ In reply to ]
Quote | Reply
I know it's an old thread. But I couldn't find the specific answer to my question and the old Silca tables have been removed from their web page (found on Google), so I'm posting my findings.

If you have one of the many inner tubes that are available now in 42mm and removable presta valve cores, and a 60mm deep section rim, you may be wondering what size Silca RVC extender to use. I'm talking about the "older" style extender with the rubber gasket which are not sold directly by Silca now but are still available as a branded OEM product, eg Zipp or Enve.

I have Conti butyl tubes and also the Silca/Vittoria latex tubes, both in 42mm. The Zipp/Silca 34mm RVC extender works perfectly with my Flo 60 front wheel and minimises the amount of valve on show. The rubber gasket is positioned just right for where it exits the carbon fairing.

Copy of the old Silca table here. On the chart it looks marginal but as above, 34mm works really well with 42mm on a 60mm rim.





May help somebody.

Thanks,
Rich.
Quote Reply