TREAD SEPARATED FROM THE TIRE AND DAMAGED THE VEHICALE. I HAVE PHOTOGRAPHS OF THE TIRE AND THE TREAD. I ALSO HAVE ONE OF THE ORGINAL TIRES LEFT ON THE SPARE RIM. GM WILL NOT REPAIR THE DAMAGE BECAUSE THEY SAID THEY NEED THE OLD TIRE. I WAS 3000 MILES FROM HOME AND HAD TO PURCHASE NEW TIRES TO GET HOME I HAD TO KEEP A GOOD TIRE FOR THE SPARE NOT THE BLOWN TIRE.*AK