Bicycle Mechanics - Replace Tufo valve stem?
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11-20-12, 10:58 PM
I, uh, rolled a Tufo cyclocross tire and in so doing ripped out the valve stem. Rats.
I don't know about the innards of Tufos. I pulled off a bit of the base tape near the stem and learned that there is no stitching. I googled a bit and it seems that maybe there's no inner tube! What's up? I know they recommend repairing via their sealant but my problem is worse than that. Any hope? Fingers crossed!
Has anyone kludged together such a repair for these tires?
I was thinking of poaching a section of inner tube with a valve from another even worse off tire and somehow gluing it into the Tufo, maybe splicing it into the Tufo's tube, if there is one. I see from a Velonews letter to Lennard that it's possible to splice inner tubes. Whew! I like this narrow 'cross tubie and would love to somehow rescue it. I'm willing to spend some time on it as an experiment.
Can't help on the Tufo, but if it isn't rubbing salt into the wound, here's a hint for the future.
1- don't know if you did, but NEVER use valve nut, or even a valve cap with tubulars. If the tire rolls, this will trap the valve in the rim breaking the valve if you're lucky, or your neck if you're not.
2- Cyclocross tubulars put the rider between a rock and a hard place regarding pressure. It's the pressure that constricts the tire onto the rim, so lowering pressure increases the chances of rolling a tire. OTOH, you have to lower pressure to suit off road conditions. This means you're much more dependent on the glue alone to keep the tire on the rim. Years ago, when I was fond of killing off my old road stuff in cross, I had my best luck with Fasttack. It was too strong for road use, since it would pull off base tapes when I flatted, but would keep cross tires on very well.
In your shoes, I'd put that tire aside until I had a tire destroyed by a wall cut. Then I'd take that one apart, both to scavange the valve and study it's construction to see if this one can be saved. There's no reason to bull your way through now, since you'll need the valve anyway. So be patient, and wait for a tire to make the ultimate sacrifice.
11-21-12, 12:24 AM
I don't know anything about Tufo tires, but I just recently asked about sources of screw-in tubular valves on the rec.bicycles.tech newsgroup. The news wasn't good.
yellowjersey.org was the last place in the US selling such valves but they stopped in the last few months.
Mr Muzi did not relate exactly why they stopped; if it was yellowjersey's own decision or if their distributor stopped carrying that item.
He did note that Specialized is the only brand left that uses screw-in valves.
11-21-12, 02:43 AM
I think the core, upper half, is different from the end formerly bonded in the inner-tube-liner.
LBS has a couple in the inventory, I'll go eye them next time I'm in..
think the ones ordered were road tubular/clinchers,
but I expect the stem bonding is the same..
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