Well i guess one of the Miyata tires may have been too old. It blew out the sidewall today on ride that sounded like a muffled 22, but loud enough that a person sitting in his garage 1/2 block away heard it! good thing I carry a spare tire because my boot wasn't going to fix that. It tore about 1 1/2 inches of side wall out but only a 1/8th inch hole in the tube, so I was able to patch the tube on the side of the road. The guy 1/2 block away came walking over to see if I was ok and needed any help, but I had it handled; he said he never seen anyone carrying a spare tire before and thought it was a great idea.