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650, I think it was, maybe 640, way too small, I have scores of them that you can no longer read the Michelin logo because of rollover. The S650 platform is still a strut car, has a narrower front track, more aero loading... and the went with a smaller front tireWhat was the tire size that you had to use last year?
680that seems like an incredibly small tire for how heavy that car is. How big is the rear? does the GT4 run offset tire sizes?