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st185rc posted some good info. just don't forget that you lose torque and gain top speed when your tire OD gets larger.
the big power big circuit cars run big wheels so they can fit large brakes to deal with the enormous heat. IMO the smallest wheels that will fit over the smallest brakes you can get away with with the widest and stickiest tire is the best you can get.
i use my FR-S in autocross. the factory brakes have never gotten too hot on a course yet. and i know we can fit 16's. 245 is the widest tire i can get that fits my rule-set that fits a 16. so that's my formula.
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