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Will 31 71 18 Michelins fit on the rear of a 997.2 Cup or are they too big?
The 710mm tall "RSR" tires were used on these and 997.1 cups in the Grand Am series, but the rear fenders needed to be flared and often the inside of the wheel well needed to be "tubbed" for more room inside and above the tire. My Grand-Am car had that done while I owned it.