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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-15-04, 07:45 PM   #1
countyquest
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tube slipping - how to stop?

Hi everyone
I'm having problems with flats with cut stem bases. I do my best to keep them straight, keep my tires aired up properly. If I notice the stem going angled, I stop to deflate, straighten, and inflate. It is happening on nearly every trip. (It is only happening on the front tire.)
Should I drill the hole bigger, or is there another root cause that is making the tube rotate in the rim? It's driving me NUTS.
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Old 06-15-04, 09:34 PM   #2
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I wrap some cloth sticky tape around the base of the valve stem which acts as a stopper, preventing the valve moving around, and also stops it pulling through the hole and tearing.
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Old 06-15-04, 10:07 PM   #3
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Maybe the tube is for a narrower tire, and is thus not filling the cavity as well as it should? Just a thought. Maybe the tube's for a smaller diameter tire (26" tube in a 700 rim/tire, e.g.)?
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Old 06-15-04, 10:34 PM   #4
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Assuming that you are maintaining the correct tire pressure (and it's a schrader valve), you could consider using presta valved tubes, which have a thread all the way own the valve stem, with a ring that you can thread down.
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Old 06-16-04, 12:12 AM   #5
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Continental makes schrader tubes that have a lock nut just like a presta tube. If nothing else that valve will NOT move.
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Old 06-19-04, 08:03 PM   #6
countyquest
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Thanks everyone for the great help.
I found out the problem-my tire was worn out. Evidently, it had stretched and it was also turning on the rim. I figured it out when I realized that the tire was coming off the rim way too easily when I changed the flat for the third time this week.
I bought a new tire and that sucker is staying as straight as can be.
Again, thanks for your help.
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Old 06-21-04, 11:04 AM   #7
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Are you using decent rim tape. Velox cloth tape is cheap, easy to fit, lasts for years and prevents a whole range of inner-tube problems.
Also check if the the valve hole of the rim has a sharp edge. Emery cloth can take the edge off.
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