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Just FYI...Most of us are using 205/50-15 for autocross. The conventional wisdom in autocross is that wider=grippier=better and the marginal weight savings from a 195 tire won't get you anything. But it could be worth trying. The SCCA stock-class rules also require OEM-dimension wheels with an offset no more than .25" different from stock, so a 45mm offset aftermarket wheel isn't legal.
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