The plan is to ride tubeless and if you get a puncture to install a tube? Or are you asking about spare tubeless tires? GP5000 are foldable, so that works.

There are tubes with 80mm stems. AFAIK that's the longest available. Even with 80mm stem you would need a valve extender on the zipp 858. Might as well run a 60mm valve stem with an extender because 60mm is more common. Install the valve stem ahead of time and test the seal. It's fine as long as it fits in your flat kit.

I'm a fan of butyl for spare tubes. Latex leaks CO2 fast, and is harder to install correctly by the side of the road.

TPU would be better than butyl on all dimensions except cost.

On average yes but it greatly depends on the specific TPU tube and tube/tire combo.

That's for rolling resistance. Pay no attention to few grams of weight difference. We don't constantly brake and accelerate in triathlon. Crit racing maybe it'd make a tiny difference.

You need a plug kit and two CO2s.

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We need someone to try out the $2 alipexpress ones and report back. :)

I'd do it for the lulz. Some safe predictions: worse than butyl. Made as thin as they could possibly be made. Can spontaneously burst for little reason or no reason. Valve or valve stem are leaking. It's a little too small or a little too big to fit on a rim properly. Smells of solvent out of the box.

Riding tubeless with sealant, I have gotten slices that sealant won’t plug. I have used an empty gu package to line a slice and install a tube.

You can get tubulito or ridenow TPU tubes in long extension lengths. IMO TPU is the way to go for a flat kit (I run latex tubes for training/racing). The light weight is a side benefit; the real advantage is that they pack really small. Crr for TPU tubes varies from being close to latex to almost the same as butyl....but for a spare tube it really isn't a consideration IMO.

example (45-85mm stems available): https://www.amazon.com/...LLPS93X9LD1&th=1
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I agree on the small packing size. For road and gravel I now carry a small pump. But for racing I have co2’s. I’ve seen some concern about TPU with cold co2 temps and possible fragility. Any firsthand co2 tpu experience?

Before I went tubeless I used Tubolitos for years. I never experienced any problems with using CO2 inflators with the TPU tubes.

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That’s exactly what I was looking for and couldn’t find!!! Thanks!!! I also will be using c02 in the event of a flat.

I just clicked on link and they are only 85mm valve stems. Still too short for zipp 858 wheels

I just use the straw type extenders that don't relocate the valve core. I pre-apply teflon tape to the valve threads for a good seal.


These are the Zipp ones, but cheap amazon/aliexpress/ebay ones work just as well.

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Whilst it was epic muppetry on my part, one of my early tubeless rides I got a puncture with a slice big enough to need a dynaplug. That was ok, but lost some air, so at top of next hill (group ride regroup) went to top up the pressure, bike slipped from where it was leant and I bent the valve. At that point not having a spare tube/extender even with 4 CO2, dynaplugs and fibre sealant left me stuffed. I now have a tube and extender in the seat bag.

None of them answer OPs question because they're not long enough

It’s looking like no manufacturers produce a light weight tube with a 100mm stem. Want to keep it simple and compact, was hoping a tube would fit in the frame tool storage on my Argon18 E119. I will get a tubolito with a valve extension and see if it fits ahead of the tool bag in the storage compartment.

Remember this was for a spare tube...

Yes, a valve extender adds no additional significant weight or size. In the case of revoloop you don't even need teflon tape. And I also have good experience with co2 and TPU tubes.

In case it's too long to fit with the extender, you can always pack the extender parallel to the tube and attach it right before use.

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I will try that! Prepare for the worst and hope for the best.

It's not as big a deal as you think. People have been rocking a latex tube and extenders and the small tool for extenders/valves for decades now.

I still bring the extender, but honestly, every time I flat with my tribike now, I just use the tool to remove the extender that's on the flatted tube and transfer it to the new tube. It adds barely a minute to the total time, and is a rounding error compared to the whole rigmarole of checking for thorns, proper mounting, etc.

What tool are you referring to?

Park tool

Both removes the core as well as tightens the valve extender on installation

jimatbeyond wrote:

What tool are you referring to?

If you buy a valve extender, this little tool is usually in the package and it works very well so you can keep it in your tool bag.

https://www.amazon.com/gp/product/B005UGC2EG/ref=pe_2640190_232748420_pd_te_o_mr_ti/137-3248289-1387420?
_encoding=UTF8&pd_rd_i=B008RVWF66&pd_rd_r=172CB5XASZSG4C76HVD8&pd_rd_w=e53cP&pd_rd_wg=9uedq&th=1&psc=1


To OP, get a spare tube with 45mm valve and get the 60mm valve extender and they should work for you. Since you have 858NSW wheel on both front and back, you can install the valve extender and keep it in your tool bag. I have 858NSW in the front and Super-9 disc in the back. If I get a flat in the front, I just simply move over 60mm valve extender from the old tube to the new spare tube. If I get a flat in the back, I just use the spare tube as is since 45mm fits perfectly on Super-9..

You can use your fingers to tighten a valve extender.

Yeah, no. That sucks and is unreliable. I've tried it, unfortunately when I flatted out on the road and forgot to bring the tool. Kept losing air at the extender connection as I couldn't tighten it enough. Had to slow roll it back on a flat tire (luckily wasn't tooo far).

Just bring the tool - it's so easy to use, and tiny.

Did you have any Teflon tape on the valve's threads?

Nope. I've never needed it, and have been using extenders for years. That's like for the old-school not-good extenders - extenders nowadays are excellent with air seal - no teflon needed.

You said:

"Kept losing air at the extender connection as I couldn't tighten it enough".

If you had used Teflon tape, you wouldn't need a tool to tighten the extender.

And the old school valve extenders work great.

It's wayyy easier to both carry and tighten the extender without Teflon tape than to wrap teflon tape - especially when the tape's going to be sitting in a bag for most of a season unused, so who knows if it'll still be in place afterwards.

Teflon tape is totally obsolete with extenders today.

It's interesting to hear you say that because I have been using spare tubes with pre-wrapped Teflon tape and old school extenders for around 34 years without any problems.

If you go with the extenders that relocate the removable valve core, you can pre-install a core from a previously flatted tube on the extender so you only have to remove the core on the flatted tube, not install it on the extender as well during the race.

Personally I just use the "straw" extenders (no valve relocation). Been using them for 20 years with no issues.

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I've been using these Cyclami ones from Aliexpress for almost a year. No punctures, very light. Only drawback compared to butyl that I've noticed is slightly more air loss but I pump my tires before every ride or at least every couple days. They have 80, 60 and 45mm valves. They cost me ~ $5 / tube and that included patch kits.

Ultralight Bike Inner Tube 700c 18 25 28 32 Road MTB Bicycle TPU Material Tire 60mm 80mm Length French Valve Super Light CYCLami (aliexpress.com)

I run 28mm tubeless. I was carrying a spare tube in addition to plugs / CO2, but altered my approach late last year. I'm now running the Vittoria tubeless inserts, but still carrying plugs & CO2. I no longer carry the tube, tire tools, wrench to remove the wheel or extenders. Plan is to plug / reinflate any flats, with the insert as a "run-flat" back-up to get me home if the plug doesn't work. Have not had to use the inserts yet, but I did try a test ride on them and they seemed good enough to get me home.

I like this approach better, as my tubeless tires are really tight and tough to remove / reinstall. I hated the idea of having to do this on the side of the road, especially hours into a ride where I'm likely to be sweaty / cold / wet.