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It appears that the rolling diameter is approx .9" different front and rear on the factory fitted tires.. For my autocross tires and wheels I was thinking of running 255/40-18 and 275/40-18 which are approx .5" difference in diameter and was not sure if that would cause an issue with the ABS and Traction Control systems.

Any input would be appreciated.

David
 

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I played around with ODs and have experienced no issues.

Good luck with yours.

 
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