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x2. Although not optimal, they worked well enough for me to win my class in a divisional autocross championship(Great Lakes Solo Series) on my 00 Civic Si.
same with my car, but my co-driver was the one that got the jacket at the end of the year. 225/50/15 on factory 99 sport wheels
we didn't like the 225 50 15s on our NA (didn't do well for lap times being taller like that) but I can see where it would be beneficial for turboed cars
15x7 is the max wheel size in SCCA's ITA class. Most cars run 205s or 225s, literally hundreds of race cars running 225s on 15x7s without any problems/concerns. Our car runs 205 BFG R1's on 15x7 panasports and they feel pretty darn good to me.