trekchik - I have a 1200T. Front tire hasn't been a problem, just the back.

The hole is on the side, near the rim. I picked up my new tires yesterday, got some continentals that seem a bit more durable than my stock tires that came with the bike. So I'm hoping this is an isolated incident

Thanks for the ideas. They coudn't tell me what caused it either unfortunately. I was on pavement at the time, but had been riding on a fine grave path for about an hour prior. I will check my rear brakes for any uneven wear, etc.