I had something happen to me today that's never happened before (and I hope never happens again). After riding for about 20 miles, I turned at a corner, and I heard a weird noise coming from my front tire, as if something was stuck on the tire or in the spokes. Then suddenly I heard a very loud pop, and the tube blew out. Fortunately I was on a group ride, and the guy who changed the tube (yes, I could have done it myself, but it would have taken forever) said the tire came off the rim, and that's why the tube blew.

Now, I've had flats before, but never from the tire coming off the rim. Any idea why that could have happened? I don't think my tires were underinflated, since I put air in them last night, and I'm sure I've ridden on underinflated tires in the past. So I'd be interested in hearing your thoughts.

Thanks,

Jo