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Old 10-03-2012, 07:40 PM   #25 (permalink)
Dave Philips
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Join Date: Sep 2011
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Tire diameters

I don't see that you've corrected for tire overall rolling diameter between the wheel and tire sizes you are comparing. You may have significant odometer and speedometer error/ changes as a result of the wheel and tire swaps that you should correct for. I agree that a smaller/lighter wheel and tire will often lower rolling resistance. Also, narrower tires probably will have less drag. Tire Rack publishes accurate tire diameters for each tire they sell.
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