Why did my tube blow?

[Biker Jo]

Thanks for all the advice.

After the flat was fixed, I finished the ride (another 12 miles) without a problem, even though the tire wasn't inflated to the proper PSI. I pumped up the tire last night, and everything seems to be okay - I don't see any bulges or anything. But now I'm worried that it could happen again. (I tend to worry a lot!). I'm just hoping that it was one of those freak occurrences, since, like I said in my original post, this is the first time (and I hope the last time) this has ever happened.

[DebW]

Overinflating a tire could cause it to blow off the rim. Underinflation would not, but could cause a pinch flat. Since the tire had been mounted for a year, it was probably not a bead seating issue.