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latex tube flats near valve stem

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latex tube flats near valve stem

Old 09-25-12, 07:45 AM
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latex tube flats near valve stem

I race CX for fun so I have decided to stay away from a tubular wheelset (for now). Instead, I started to use latex tubes with my clinchers. The rear is fine... I'm actually still using the same tube from last season however I keep getting a flat on the front tube near the valve stem. It doesn't look like a punchture, rather a tear. Before I keep flatting (these tubes are $$$), I thought I'd ask here first for any suggestions. I'm being careful in installing the tube however it keep happening.

TIA
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Old 09-25-12, 08:22 AM
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You probably know this already but I thought I'd throw it out just in case: When inflating clinchers, sometimes the valve can get pushed into the tire a bit when attaching the pump head. This allows the tube to inflate around the valve and sometimes into the valve hole. When I inflate tires that don't have enough air in them to keep the valve from pushing in, I put the little nut that comes with the tube on finger tight so that the valve stays in place. I take it off after the tire is inflated and throw it in my spare bag.
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Old 09-25-12, 12:21 PM
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I'd try new rim tape, and maybe check the valve hole for any burrs or whatnot while you're at it.
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Old 09-25-12, 01:50 PM
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Tire creep at low PSI , might be carrying the tube around with it.

then the shear forces the stem out of the tube..
since the rim hole is fixed

lots of talc in the tire,

and maybe as a last resort glue one tire bead to the rim, in a couple spots
so It won't creep around rim from torque of acceleration, or braking.

Last edited by fietsbob; 09-25-12 at 01:54 PM.
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