Got my Zipps today. I ordered aluminum valve stems with them, that do not seem to install per the Zipp instructions.
Am I correct that I remove the valve core from the valve, screw on the aluminum valve extension (putting plumbers tape on the threads), reinstall the valve core in the valve extension, inflate per usual?
Thank you.
that sounds about right!
When I put my valve extensions on I placed tefflon tape on the threads of the valve stem, opened the valve (not removing only opening), then screwed on the extensions tighten with hex wrench (NOT closing or tightening the valve) Then just pump it up. I haven’t had any trouble since - so even if it was the wrong way, it seemed to work.
Are the stems designed to move the valve core or are they just extenders? I didn’t think Zipp made any to move the actual core out (Tufo has some), just extenders, but I could be wrong.
If they are just extenders, they just screw right on top of the current value stem. You need to open the valve and maybe use pliers to open a little extra so it doesn’t work its way back closed. Put on the teflon tape as you did and just screw on.
Edit: I checked Zipp’s website and only saw extenders.
Yes, I think Zipps are just extenders. You don’t remove the valve core.
you do not remove any valve core.
just open the valve, and then slightly “force” it past that point (1/4 to 1/2 turn max.) so the blocked thread holds the valve stem open and vibration will not close it on you while riding, etc.
So my valve is never screwed back down?
<< So my valve is never screwed back down? >>
correctamundo.
Seems strange, but it works just fine. The valve extender keeps anything from hitting the valve and letting the air out, so no need to screw it back down.
Just make sure you use the plumbers (teflon) tape w/ the extenders - I didn’t, and it leaks like a sumnabitch when I inflate the tires. I’ll fix it the next time I’m motivated to take the tires off and do it right… (aka - never.)
I went to a website, and here is a pic of the alum extenders. Looks like the core does come out and get put back in the aluminum extender.
Umm, yep, those are the ones where you move the core. Are those Zipp or Tufo…or something else? What part are you having trouble fitting into what?
Keith
Well no problem yet, but the Zipp instructions were per what the other guys (except gasmunky) were saying, the others did not come with instructions or a picture, and I just found this now on the internet.
Thank you for your confirmation.
So my valve is never screwed back down
yes, that is correct. the valve seals quite well because air pressure keeps in closed very tightly–no need to screw it down.
also, the photos above show a different kind of extender, one that can only be used with presta valves with removable valve cores (no clincher tubes have them and only some tubular tires have them).
Zipp hollow extenders (used to be silver, now anodized black with tiny zipp logo–I use 'em) can be used on any presta set up if you follow their (and my) directions (their directions with extender, my directions posted above).
make some sense? or not?
That’s probably because Zipp only sells the extensions (where you don’t remove the core). I would actually like to try this sometime…much more civilized for inflation/deflation. Let us know how it goes!
Don’t forget to put in your sealant before you mount to the rim. Once the valve extender is on it - good luck getting sealant in (The valve has a narrower opening in the extension).
yes, that is correct. also, some of the photos above show a different kind of extender, one that can only be used with presta valves with removable valve cores (no clincher tubes have them and only some tubular tires have them).
Greg–My valve cores came out on the clinchers!
All racing bikes nowadays come with presta valves (like those shown in the photos) which—unlike Schrader valves, that kind that comes on your car’s tires—are made in two types. On has the valve core built into the valve (above). The other has the core as a separate piece which threads into the valve (below right).
Also–see Slowman article at Tech Center http://www.slowtwitch.com/mainheadings/techctr/wheel.html
Clincher wheels.
Clinchers
.
Great - I am using the Tufo tubular clinchers too. Once you put the extenders on and mount on rim, you will have a tough time putting in sealant. Of course you can always de-mount, take valve extender off, add sealant,… OR put it in before mounting and that way when you have a puncture, no worries! (hopefully).
I really like the tubular clinchers. Great option for owners of Clincher Zipps, Heds,… that are making convesion to tubulars.
And before I get flamed on the weight of the tubular clinchers and how heavy they are, let me drop 20 pounds and then I’ll worry about my tire weight!
Monk,
the extender in yer pic are NOT like the ZIPP extenders I have for my 404s.
they are the black anodized ones that Greg/ORD refers to here:
<< Zipp hollow extenders (used to be silver, now anodized black with tiny zipp logo–I use 'em) can be used on any presta set up if you follow their (and my) directions (their directions with extender, my directions posted above). >>
So - IF you have the plain hollow ZIPP extenders, then what we were telling you is correct. If they are more like what you posted in that pic, then I guess you hafta do someting about moving the valve core. That’s no my yob, mang.
<!- ZIPP Valve Extenders → 
ZIPP Valve Extenders
THIS is what I’m talking about - see above. Just a hollow black aluminum tube, that screws on.
do you have tufo tubular clinchers? if yes, they are a strange tire that fits neither category. in any case, i stand corrected.
however, to my knowledge, regular presta tubes (ones that come out of the tire completely, that you can buy replacements at the LBS) that go in regular standard clinchers tires never (or very rarely these days) have removable valve cores.
in any case, even with the removable valve cores that you seem to have(?), you can ignore that they come out and use the hollow zipp extenders IF you follow their (and our) directions.