I took a look at the bike afterwards, and the tire was split straight down the middle, all the way around. So my guess is that something got wedged up under the front fender, and started rubbing against the tire. I've never had a blow-out either. I looked into the the tire model, to see if there were any recalls, but everything looked fine. You know, I hadn't even thought of tire pressure, but it was turning just fine @ slow speeds, so it didn't seem like it was low. I'll make sure to check the pressure on my new bike right away!