Join Date: Mar 2006
Location: In a cardboard box by Alki beach.
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Sounds to me like the shard of glass, or whatever it is, is still hiding out in the tire. This is pretty common, you don't see it on casual inspection but the flexing and compressing of the tire rubber moves the sharp bit enough to cut the tube again and again until you remove it. You have to take the tire off, turn it inside out, and get in there with a pin or something small and pointy and dig until you get it out.