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causes of tire flats(6 posts)

causes of tire flatsmercurymike
Jun 13, 2003 2:49 PM
I know rocks and thorns cause flats. Also there are pinch flats. But is it normal for the Presta valve to start leaking? My buddy and I were on a chat trail extended ride and we had four flats. could not find hole in tube, but valve seemed to not hold air. Anybody?
A hole in the inner tube. nmPoserFred
Jun 13, 2003 2:53 PM
OK, serious answer. YepPoserFred
Jun 13, 2003 2:56 PM
You can yank a whole stem right out of the tube. I dun it before. Be careful when removing the pump attachment... don't yank on it.
That can be caused by a popular flat remedy ...Humma Hah
Jun 13, 2003 3:01 PM
... Most folks don't use it with Prestas, but the fibers in flat-sealing agents like Slime can prevent a valve from seating properly. I've had that happen with Schrader valves.

Any contaminant that gets on the valve seat can cause it to leak.

I've also had a valve stem fail. Again, a Schrader. The brass threaded section de-bonded from the rubber stem. A Presta could also debond from the rubber. My failed stem was over two decades old.
Impressive... not only did it last 2 decades, but ...PdxMark
Jun 13, 2003 3:52 PM
when it failed you tracked it down to de-bonding... Wow! You win this year's combined "retro gear-inner tube age tracking-failure analysis" prize, which is a spare inner tube from me when your next one de-bonds...
Seemed not to hold air?Kerry
Jun 14, 2003 1:21 PM
So, when you got back from the ride you pumped up the tube and held it under water, right? That's how you find out where the leaks are. Presta valves do fail, and are sometimes defective, though it is not a common occurance with a quality tube. Are you saying that 4 different tubes leaked at the valve? This is quite extraordinary! Or did you just take off the tube, pump it, not find a leak, and put it back on the wheel? You're not clear on this!