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I apologize if this has been beaten to death. I've searched many places and found a spreadsheet but my tire size is not listed. I recently bought a 2003 Z06 and prior owner just installed Extreme Contact Sport tires on the rear in the (unfortunate) size of 275/35/18. I need to replace the fronts and I think the following size will maintain the correct ratio of front-to-rear balance to keep the TC and AH functional: 255/40/17. The rear diameter is 25.6" and the front will be 25". Is this close enough to keep TC and AH from going nuts?
 

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check this site out, if your between a diameter radius of 0-2% your great, 2-3 might rub depending on how used the suspension is. 3%+ stay away. Thats what i learned anyways, finding tires that fit on our rims are a #$%#$% and i have been looking for weeks, so most likely why the past owner went with those sizes.
 
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