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Rim size will govern a bit of what width wheel/tires you're trying to use. I think people use 17s to go with a square setup of 255s but that may also require swaybar changes to keep understeer in check. A square setup has the ability to rotate all 4 evenly. Also, not all tires are available in all rim size and width combinations.
I looked into this over the winter to possibly make some changes. I decided to stay with 18s because it is the best compromise for me with the car's setup and classification.
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2022 PCA Zone 7 Autocross Chair
2001 Boxster 986 (base) #414
-PCA GGR: Class Champion AX12 '18, '19, '20; CC06 '21; CC05 '22; PAX 5th '19, 3rd '20, '21, & '22
-PCA Zone 7: Class Champion P14 '18, '19; P02 '20; P-03 '22; PAX Champion '20 & '21
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