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Discussion Starter · #1 ·
ahh, I found the right spot to post this in.

Hello everyone! I am new here and kind of a beginner at mountain biking. I have this problem with the tires on my mountain bike. About every month or so of regular riding the innertube will break in the same spot consistently. It always breaks right at the base of the valve. Whenever I get a flat I take off the tire and look at the inner tube and the base of the valve is always split like the whole valve is almost severed off, not completely but at least like one third to one half of the circumference of the rubber at the base of the valve is split open.

I wonder if anyone one here knows why this always happens and what could be the cause of it. Any help or insight would be greatly appreciated.
 

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Fat-tired Roadie
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When your tires are inflated, do your valves look crooked?

Are you using Presta tubes in a rim drilled for Schrader?
 

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Discussion Starter · #3 ·
the rim originally was for presta tubes but i changed them to the schrader type. but, it was doing the same thing before no matter which type of valve i was using.
 

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How did you change them?

Check to see if the valve hole has a sharp edge on it, if it does smooth it out with some fine grit sandpaper.
 

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Bicyclochondriac.
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Trill_01 said:
ahh, I found the right spot to post this in.

Hello everyone! I am new here and kind of a beginner at mountain biking. I have this problem with the tires on my mountain bike. About every month or so of regular riding the innertube will break in the same spot consistently. It always breaks right at the base of the valve. Whenever I get a flat I take off the tire and look at the inner tube and the base of the valve is always split like the whole valve is almost severed off, not completely but at least like one third to one half of the circumference of the rubber at the base of the valve is split open.

I wonder if anyone one here knows why this always happens and what could be the cause of it. Any help or insight would be greatly appreciated.
Sounds like the hole in the rim has a sharp edge. Also, do you need to pull hard on your pump in order to release it from the valve? It should come off pretty easily. I have one pump that would not let go of valves easily, and it would occasionally rip a stem at the base.
 
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