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You will need to go with at least 17s if you want a good sticky tire for autocross. Anything smaller is very hard to find good performance street tires for anymore. There are race tires for the smaller sizes, but that could get expensive fast. The lower the profile of the sidewall, the more responsive the tire will be to changes of direction, downside being that the lower the profile of the sidewall the harsher the ride will be. Your choice on what balance you want to make.
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