The weather was nice this morning --- by MY standards! I noticed that the rear tire was thumping slightly. At a light I looked back and found that the sidewall was beginning to separate. I think that I may have put to much pressure in the tire. It's rated, I believe, for 75 lbs. I am have put it up to 90. I wouldn't have thought that would make the casing give way.

I cut up a FedEx letter envelope to use as a boot for the tire. I hope it gets me the 16 miles to the bike shop on the way home tonight.