Originally Posted by
revchuck
Were all the flats in the same tire? If so, it sounds suspiciously like you picked up something like a glass shard or a piece of tire wire. Try running a cotton ball on the inside of the tire and see if something snags on it.
3 flats on 3 different tires. First one was a thorn or maybe a pinch on some bumpy gravel (front gp4000s2). 2nd was a nail and that tire is toast(rear michelin power). 3rd was a very small piece of wire(rear gp 4000s2).