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I'm not familiar with BSX setup. I say 18s to start because RE71s fit stock size. If you go with a square or squarish setup, 17s may be the way to go.
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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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