The bolt punctured the tire head first and put a pretty big hole in it. It also hit just in the perfect spot to miss the tread. I couldn't tell for sure what the culprit was until the guy at the shop changed the tire and pulled that bolt out of it (from the inside of the tire). So, I got a pretty good looking used tire and service for $60, all included. The good thing about this is I found a decent used tire shop. South Side Tire Services in Austin, if anybody wants to know. Good folks.