Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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As Mudpie suggests it could be a bad valve hole in the rim, and filing the edge of the hole in the rim might help, but I suspect there's more at play.
I'm guessing that you're using tubes where the valve is molded into a conical section of rubber which comes out from the tube. Some of these are pretty poorly made and the valve ends short of where it meets the tube leaving only a heavy rubber section right where it passes through the rim. Try to buy a tube where you can feel that the metal valve goes all the way to the tube and ends in a little metal flange that you can feel through the tube.
If you can't find one like that, try punching a hole through a patch and gluing it on as added reinforcement at the base of the valve.
Also next time you mount the tire try to be careful that the valve is straight and points directly to the axle. Often I see people with crooked valves which means that the tube is shifted around a bit and straining the base of the valve.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
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