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On my last 3 out of my last 4 rides, I've punctured my front inner tube on very innocuous descents. On inspection of the tube, it looks like the valve has ripped away from the rubber on one side rather than an actual puncture through the tyre.
I initially thought it was an issue with a batch of tubes, as the first two that did this were from the same batch of Continental tubes. However, the third one that went yesterday was a completely different make, which makes me think that it is something to do with the setup itself.
The tyre is relatively easy to get on and off with levers, and I noticed that the rim tape can be moved when I have one side of the tyre off the rim. Is there any chance that the tube is being rotated and ripping the valve out? If so, what can I do to stop it? I'm doing the Kielder 101 in a fortnight and don't fancy carrying 20 tubes just in case (as it's impossible to patch where the valve rips the rubber).
And don't say go tubeless - I'm a serial tyre changer and need to validate the tyre mountain at the back of my garage!
Chuck loads of talc in the tyre so it doesn't grab the tube.
Cheers Josh, will try that
Try changing the tyre.
I had similar problems. The (rear) tyre bead was loose so the tyre could rotate round the rim under braking & pedaling which would tear the valve stem off the tube.
Changing to a new tyre sorted the problem.
🙁
But I like that tyre (Conti Rubber Queen)
well if you like the tyre, change the rim.
[url= http://singletrackmag.com/forum/topic/puncture-by-valve-stem-coming-out-of-the-innner-tube ]Similar thread[/url], from several years ago
You've probably liked the tyre too much. Look at the bead - does it look polished? Iv'e had this problem a number of times over the years and it's usually because the tyre is old and the rubber at the bead has become dry and polished, so the tyre just doesn't grip the rim well enough. Higher pressures will help, but only if you don't mind higher pressures.
Other things also help (see the talc suggestion above - logically it probably shouldn't make a difference, but it does seem to). Also cleaning the bead with meths/alcohol can help it grip. I've found that ultimately your simply delaying the solution of buying a new tyre.
In the mean time keep a close eye on your valves and see if you can spot them starting to lean - that's the sign to deflate and reseat everything.
This is why talcing the tyre/tube is a good idea. It allows the tyre to slide over the tube rather than stick to it, so you can continue to use your tyre of choice.Try changing the tyre.
I had similar problems. The (rear) tyre bead was loose so the tyre could rotate round the rim under braking & pedaling which would tear the valve stem off the tube.