I went to the dealer the other day for a oil change and tire rotation. They discovered a tire that had separated about 3/4 of the way around on the inside. I inspected the tire and couldnt find any place where i could have hit something. I had to buy a new tire. Goodyear wouldnt do anything to replace a defective tire. It still had 8/32 dread depth. Car has 45,000 miles. Not a Ford problem but I will be replacing these with something else soon.