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Those tires show the exact failure pattern of both the Michelin Pilot Sport Cup 2 and Goodyear Eagle F1 Supercar 3 & 3R tires when stored/moved in extreme cold temperatures. They don’t crack and fail in the sidewalls, they crack in the center tread area. If you picked the car up in June, then that is a clear warranty replacement. Your dealer may not agree without being educated on how the cold affects those tires...I presume they sell more Tahoes and Silverados than ZL1s. You may have to provide the dealer with some research to help them understand, but you are hardly the first person to encounter this problem on a brand new car delivered with the “summer only” tires.
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