Join Date: May 2010
Location: Bristol, R. I.
Bikes: Specialized Secteur, old Peugeot
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I've received many tips on this forum that have been more than a little helpful to a nooby cyclist. This being so, I hope to add a tip of my own to flat prevention and the general pool of knowledge.
Two flats, among others, have been due to leaks around the valve stem. After the second such flat, on inspecting the rim I found that the valve hole, after drilling at the factory, had been left with rough, ragged edges. Evidently there is enough movement between the tube and rim to create sheer forces that cut the tube/valve stem connection. After peeling the rim tape back a bit and making this discovery, I sanded and filed a bit of a chamfer in the rim hole to relieve the sharp edge causing the problem. Fixing flats on the road is such a PITA that for additional insurance I added some extra protection in the form of a small patch of rubber, about 25 x 25 mm (1 sq. in.) with a small hole in the middle. This patch is pushed on over the valve, even my spare tubes, with the intent of providing extra cushion. This and checking for glass and sharp debris seems to have reduced flats noticeably, together with planet alignment.