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About a year ago, GRM magazine did a test to confirm that a light weight wheel and tire improved times on an auto-x course. They used a Miata for the test, and found that the heavier weight wheel was actually faster!
After examining the data, it was apparent that the heavier wheel was faster just because that wheel/tire combination was just a bit smaller diameter, and thereby lowered the effective gearing and improved acceleration. Just a fraction of an inch less diameter completely over-rode the weight effects of a heavy wheel.
So, you should probably look at the whole package of resulting wheel / tire diameter, sidewall stiffness, etc. rather than being overly concerned about the last ounce of wheel weight.
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Kippis
986S
991S
Van Diemen RF97
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