Join Date: Feb 2007
Location: Central CA
Bikes: Fuji SST, Cotic Roadrat, Bianchi SASS, a bunch of others
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When you're searching inside the tube, flex that thing all over the place, and really rub your fingers into the rubber. A strand of braided brake cable wire can be almost invisible.
Also, like mclaughlin said- if your tire is worn, its simply going to be more susceptible to punctures. Worn rear tires will have a flat stripe all the way around in the center of the tread.
I wish bike shops patched troubled tubes, rather than just replacing them- tossing out the old tube discards the evidence needed diagnose future problems.