I run 235s in the front and 255s in the rear with a lot of success. I've tried all sorts of sizes. If you're running outside of scca street class run rear wheels all around and run 245s (some people say 255s work as well)
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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