I had an interesting event happen to me this past week. I have owned and run these tires for three TTs. I ran over what looked like a roofing nail since I had a bif recessed pattern in the rubber around a hole in my seam between the tread. I was going along and a fellow came along side telling me that I had a tire that had blown out. I pulled over the outside only of the side wall had blown completely out. The rest of the tire was in tack. I guess the nail came out and the lose of air created heat build up and deteriation of the tire running on the road. It was hot to touch but the tire did not come completely apart and tear the wheel wells and fender apart. Whether this was that I had not gone far enough or the tire's quality was such that it held together. I guess luck was on my side anyway. The other three have close to 20, 000 miles on them now. So I am ready to replace them anyway, even though the other three have okay tread left. But I do like to change before I need them. Sadly I am getting the same story of " the supplies are limited for the 15 inch tires. But I do give them my five star rating.