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Originally Posted by KKreme15
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The first bulletin is from Goodyear for the for the F1 Supercar. This bulletin is from GM. I am going to guess the difference is that the tires on the ZL1 are not normal F1 Supercars like the ones you would buy from Goodyear. From what I have heard the tires on our cars were made to different specs especially for GM. Therefore although similar they are essentially 2 different tires. Hope this makes sense.