Join Date: Jun 2004
Location: Northern Nevada
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I don't think anybody mentioned diagnosis here, so lemme give you a short set of guidelines:
1. Always mount the tire with its label next to the valve. That way when you have a flat, and you find the hole in the tube, you'll know where to look in the tire for the offending object.
2. While the tire is off the rim, examine it carefully for the sharp thing. Run your fingers or a rag all the way around the inside feeling for a snag.
3. Note where the puncture is in the tube. If you have holes consistently on the rim side of the tube (the side away from the road), check the rim tape and look for protruding spokes. Be meticulous. It takes VERY little to puncture a tube under high pressure. If you have holes near each other time after time, look in that area of the tire, which you'll be able to do because you followed Rule No. 1.
THERE IS NO REASON TO THROW AWAY A PATCHED TUBE. THERE IS NO REASON TO TAKE A FLAT TIRE TO A BIKE SHOP. The patches are stronger than the original tube. I've had hundreds of flats in 40+ years of cycling, and I can remember only one patch failure, when Slime leaked out of the hole and kept my glue from sticking.
Oh, and self-adhesive patches are useless. get the old-fashioned kind with a scraper and rubber cement.