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Old 05-10-07, 07:03 PM   #1
MajorA
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Dumb tubular question

I realize that there's a separate thread for tubular topics, but thought that a stand-alone thread would stand a better chance of a response ...

I just bought my first set of tubular tires to mount on a nice wheelset (Campy Victory Strada rims laced to Campy Record hubs) that I stumbled into a while back. I put them on the wheels, unglued, just to see how much of a wrestling match it would be when there's glue all over everything, and because I read one guy's post who recommended inflating them on the rims at low pressure, unglued, for a day or two before installing them for real. Here's the question:

On the tires I bought (Vittoria Rally) the valve stem isn't threaded, i.e. there's no threaded collar which snugs the valve against the rim ... it's just kinda poking out of the hole, which nothing to secure it there, other than the eventual glue, and air pressure, I guess. Are a lot of tubular valve stems unthreaded? And is there some voodoo to installing them that I should know about?

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Old 05-10-07, 07:09 PM   #2
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My Clements come with unthreaded valve stems, Vittorias come threaded. It don't make any difference. Once you glue the tyre on the rim, it's going to stay in position, so you don't need a valve nut like a clincher tube.

By the way, I normally inflate my tyres to full pressure on a spare (unglued) rim and let it sit there for a week or two. Real easy to install at that point. And all my spare tyres on stored on rims.
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Old 05-10-07, 07:13 PM   #3
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Quote:
Originally Posted by sykerocker
By the way, I normally inflate my tyres to full pressure on a spare (unglued) rim and let it sit there for a week or two. Real easy to install at that point. And all my spare tyres on stored on rims.
+1
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Old 05-11-07, 09:33 AM   #4
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I don't use a valve nut or a valve cap on tubulars. You don't want the tire to be attached to the rim at the valve if it rolls off the rim and gets caught in your fork. I suppose you could use a valve nut to help hold the valve straight when you mount the tire and then remove the nut.
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Old 05-11-07, 07:08 PM   #5
coelcanth
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a lot of valves in general have no threading..
i never use the nuts anyway as they can tear the tube if installed too tightly
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Old 05-11-07, 10:18 PM   #6
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On tubulars or clinchers the valve nut and cap is not needed and just extra weight .
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