what ever you do, avoid the CTS V size of the supercar f1 funflats. I got 7,500 miles out of mine w/o a single burnout or a trip to teh drag strip. back and forth to work and through the gears about 12 times. They showed a wear pattern that simulated ove-rinflation even though they were run at 31-32lbs since new.
goodyear nor my cadillac dealer backed me on them.
I replaced them with the GSD3 version of the supercars but haven't had them mounted yet, but tire rack has good feedback on them.
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