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Lightweight valve extension length

Posted: Thu Jan 13, 2005 6:26 pm
by spaniardclimber
I bought a used set of lightweight and they come with very short valve extensions, Im almost unable to inflate the tubulars. Im going to order tufo 160 and Im going to get a set of valve extensions too, which is the valve extension recommended length for lightweights?
Thanx

Posted: Thu Jan 13, 2005 8:25 pm
by Samu Ilonen
Tufo makes only 28mm now. Their site has error. But they are aluminium=good for balance.

I'm getting those for my LW's.

Posted: Thu Jan 13, 2005 8:25 pm
by Weenie

Posted: Thu Jan 13, 2005 10:21 pm
by Villadsen
The threading on tufo alu extensions are prone to breaking. The length for LW should be close 40-50mm I find Zipp or HED are the best ones.

Posted: Thu Jan 13, 2005 11:34 pm
by rhsnyder
spaniardclimber,

Try this site for valve extender sizing. The extenders pictures I believe are tufo

http://www.worldclasscycles.com/valve_e ... sizing.htm

rhsnyder

Re: Lightweight valve extension length

Posted: Thu Jan 13, 2005 11:36 pm
by martin
spaniardclimber wrote:I bought a used set of lightweight and they come with very short valve extensions, Im almost unable to inflate the tubulars. Im going to order tufo 160 and Im going to get a set of valve extensions too, which is the valve extension recommended length for lightweights?
Thanx

Try and get one of the brass extensions that Mavic ships with their Cosmic Carbones (The best part of that wheel, IMO :))
I got mine for free at a Mavic Promo booth

Posted: Fri Jan 14, 2005 7:27 am
by Samu Ilonen
Tufos breaking??? I have 2004' brass models and they are very solid...but bit heavy so I'm changing them to 2005' alloy models.

I had Zipp's also they suck very hard.

They are:

-so long that valve may crack, least I had with Michelin alloy valve cracked in pouring rain when I had flat on clindher 404's...
-so thin that most pumps leak
-they must be inserted permanately or they leak
-you can't thighten valve after pumping...

Never for me.

My friend have Mavics, they looks similar but heavy brass...

After installing Tufos, they just work like long valve, nothing less.

Posted: Fri Jan 14, 2005 10:11 am
by Villadsen
Tufos breaking??? I have 2004' brass models and they are very solid...but bit heavy so I'm changing them to 2005' alloy models.


I wrote Tufo alu - not brass.

This summer I bought 4 of the 40mm Tufo alu and I agree that as long as they last they are better than both Zipp and HED because you can close the valve and they are also so light so that they dont get the wheel out of balance, however of the 4 that I bought one broke while pumping (with a standing pump, I never use a normal hand pump). One broke while changing a tyre and one broke while riding. FYI I only use them on LWs and only with Veloflex tubbies. I the picture I have marked where they are prone to breaking. At that point the alu wall is really thin (1mm or even less) - I guess that can even be seen pretty clearly in the picture.

Posted: Fri Jan 14, 2005 10:31 am
by Samu Ilonen
I quess that the reason why they make only 28mm now. And maybe they come from not same factory. I orded from then From starbike so we will see...

Posted: Fri Jan 14, 2005 3:13 pm
by gandini
Just adding an observation: I use Tufo Al extenders. I used the longer ones but they broke off at the thread due to hand pumping. I now use CO2 cartridges because they cause less stress on the valve stem. I use the shorter 28mm on Zipp 38mm rims and they work fine, with good support from the rim to avoid stress breakage at the thread.

cheers,

Posted: Fri Jan 14, 2005 3:52 pm
by Michiel
I use the 28 mm extenders on Lighweights with Tufo Tubs.

The pictures show first of all the extender with the plastic key. I advise to get one of those. The opening can be used to screw on the extender and the hole can be used to srew on the valve. But even more important to srew off the valve in case of a flat and you have to punt the Tufo sealant in :!:
You have to screw the valve off for this, check the Tufo website :!:

Second picture is the extender on a Tufo S3 < 215 gr tire. You screw it almost all the way in!! It doesn't stick out as much as seen on other pictures.

Third picture is how much the valve sticks out a Lightweight wheel with this combo. Not much, but enough and the less the better :D

Posted: Fri Jan 14, 2005 7:08 pm
by Samu Ilonen
Thanks, M!

It looks that I have 31mm ones. (brass) I don't remeber...They come 10mm+valve out of rim. So 28 is fine. Lighter and more aerodynamic. Good.

Posted: Fri Jan 14, 2005 7:08 pm
by Weenie