Interesting. I've never found to have "too much tire". I've autocrossed an NB Miata on 245s and still wanted more! 
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Originally Posted by lawren
I've found that 225/45 front & 255/40 rear Bridgestone RE71Rs on stock 17"x 7" fronts and 17"x 8.5" rear wheels is the fastest. I've also run Toyo R888R's on wider 18" OZ wheels but that resulted in slower track and autocross times (and a little fender rub). My '98 Boxster is stock with the exception of font adjustable LCA's. I think the lower HP car just doesn't like turning the larger/fatter wheels and tires.
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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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