Bridgestone Insignia SE200 tires developed "cupping" at 38,000 miles. Tire tread warranty 65,000. Firestone's "Michael" was certain that my shocks had caused the irregular high and low tire delamination spots on all 4 tires at the same time. He knew nothing about my shocks and there was no uneven tread wear. Further he said that the tire's wear bars were exposed (you could see them but being below the tread they showed no wear), so there was no way Firestone would honor the tread wear warranty.
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