I wouldn't go with the xs if you're going to ruin stock class autocross.. stock class requires 200 treadwear now. .
Everyones driving style is different, I like the widest front tire possible with whatever rear will hold the car in place and not spin out of corners. 285 so far is good, I ran the xs in 285 wit a new tire up front and old ones on the rear and the car lift off oversteerd quite a bit, now with the rival I can turn fast and power out quick so I'm happy.. but everyone drives different. You can run a 285/305 setup and still get great turn in
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