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What was the tire size that you had to use last year?
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 tire
Kohr asked me to stay on last year because of this, it was prolly a good idea as we had many failures trying to run that tire " on the edge of reliability vs performances ".
So.. good riddance
 
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that seems like an incredibly small tire for how heavy that car is. How big is the rear? does the GT4 run offset tire sizes?
 

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