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Originally Posted by Cookstar
I'm not sure if going to 18s will make your car handle any better. You might increase grip with the stiffer sidewall but the increase in unsprung weight will make your suspension less responsive and decrease your acceleration and increase your braking distance. I think autocrossers typically stay with lower diameter wheels. I know etf runs 17" Koseis when he autocrosses and Janizary chose his 17" Motegi Trak Lites specifically for the lighter weight.
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Your right just the decreased profile affecting grip with less roll. Actually the wheels and tires I picked weigh less than the factory setup by 2 pounds each. That's why I didn't go HFP 18's cause they weigh more than stock.. But as far as autocross goes 17" seems to be the sweet spot.