I recently purchased my first race wheels, Reynolds tubulars, and glued on vittoria corsa evo CX 320 tpi tires that I purchased new online. Everyone on this forum said they’re the best thing since sliced bread. Anyway, they seem to go flat fast, perhaps they lose 30 psi overnight. I have been told it could be a leak around the valve stem so I’m going to try teflon tape to see if that helps. Both tires have the same behavior. But I think that tires shouldn’t lose air that quickly. Anyone else have this problem or solutions? 30 psi overnight doesn’t sound like much, but with my body weight on top of them for multiple hours I think they will lose enough air to compromise performance in a race.
That’s what latex tubes do, you’ll be fine for an IM bike if you pump them up before the race, but don’t do any extended touring without a pump.
Have you checked they valve cores if they are tight?
I thought one of my tubulars was bad out of the get go, but low and behold when I was swapping on my extenders and testing them again… VOILA, it held air well for weeks. I use the extenders where you pull the core and then put it at the end of the extender because I find it easier to check tire pressure with a hand held gauge.
Anyway, they seem to go flat fast, perhaps they lose 30 psi overnight.
Perfectly normal for latex tubes.
I have been told it could be a leak around the valve stem
Nope.
A leak around the valve stem would cause a problem when pumping the tire up.
so I’m going to try teflon tape to see if that helps.
You should always put Teflon tape on the valve stem when adding a valve extender.
Anyone else have this problem or solutions?
Everyone who uses latex tubes has this problem.
The solution is to use tires with a butyl rubber tube.
30 psi overnight doesn’t sound like much, but with my body weight on top of them for multiple hours I think they will lose enough air to compromise performance in a race.
If you pump your tires up before your event, there won’t be any degradation in performance.
.
20cc of Caffelatex per tire will coat and “seal” the latex and solve this problem. And, it will prevent most small punctures from ruining your race.
+1 for caffelatex.
I bought the same tires, pumped them up and overnight they lost 20 psi (I made sure to put teflon tape on the valve stem extenders). I’m going to take others people’s word on this, that it is normal for this to happen but race day any pressure lost will be insignificant.
its normal
teflon tape on the extender won’t have any effect on how much air is lost.
you will love racing on them, remember they are not training wheels so they only need to be good for race day. in short, don’t sweat it and enjoy ripping the corsas!
i think i’ve read that they can lose 3psi per hour, but i think that’s a little high. you will be fine for a 5-6 hour ride. those tires are all i ride and i think the 3 psi rate is high based on experience. I’ve never had a pressure loss problem on any distance ride. after a 5+ hour ride last weekend, they were just fine.
besides, on less than smooth roads and over a long distance, you really don’t want 120 psi or higher as that is not optimal for speed or comfort.
i think i’ve read that they can lose 3psi per hour, but i think that’s a little high. you will be fine for a 5-6 hour ride. those tires are all i ride and i think the 3 psi rate is high based on experience. I’ve never had a pressure loss problem on any distance ride. after a 5+ hour ride last weekend, they were just fine.
besides, on less than smooth roads and over a long distance, you really don’t want 120 psi or higher as that is not optimal for speed or comfort.
My experience is closer to 1 psig per hour based on what I usually see overnight.