Originally Posted by Dirsuper
According to my trusty (I assume, I have three and they were all the same +/- 1.5 degrees) tire pressure gauge, the front is right between 35-36 and the rear is at 38. The manual recommends: Front 31.9, one-up at 68 degrees. 36.3 two-up or load. Rear, 36.3 one up at 68 degrees. 42.1 two-up or load. It is 73 degrees here, and I am at 1470 ft. above sea level. I weigh ~200 pounds.
Well then I guess they weren't underinflated...for whatever reason what you were doing with the bike relative to the surface you were doing it on was too much for the stock rims.