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Originally Posted by dknv
And, doesn't that help with gearing ratio, 1st to 2nd gear on most autox courses?
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Actually the lower profile 40 series tires would be better for gearing, allowing faster acceleration at the cost of top speed, not that we ever max out 5th gear at an autocross
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I guess you could argue that a top speed of 55mph in 2nd (or whatever it would be) might mean an extra shift over the 45 series 2nd gear top speed of 65mph which would slow you down, but over all the smaller tires should be advantagous.