Originally Posted by
chrismjx
Actually, the first tube that popped was a presta, and the one that popped today is a schrader. But after re-inflating both, still no bubbles or leaks that I can see! I'm mystified... Obviously the air is getting out somehow.....
Pump up just the tube (no tire) until its about as big around as your calf. If there's a hole, you'll certainly be able to find it.