What's amazing, IMO, is that it didn't fail completely. It lost some pressure but still got me home. I think I know what caused it to fail. About a month ago I got a slow-leak flat on the rear tire, which is almost impossible to inspect while riding. No telling how many miles I rode nearly on the rim. Surely this contributed to the failure. BTW, this tire served me faithfully for 1200 miles--not bad considering my rear tire carries about 65% of my 225 pounds. -- Bill Anton 2001 Vision R-40 26x26 SWB OSS Lubbock, TX, USA