Inspect the rim tape, even the slightest edge of an exposed spoke hole will cause a puncture when air pressure pushes the tube against the rim
- or -
Check the tire bead, I once had a reinforcing wire protuding through the casing on the bead that cased repeated flats.
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2003 Iceman Challenge - 2:34:55 - 897 / 2,000*
2002 Iceman Challenge - 2:39:23 - 1093 / 2,186
2000 Iceman Challenge - 2:49:18 - 1516 / 2,153
*estimated