Quote:
Originally Posted by Gixxer335iCoupe
If the speedo/odo sensor is on the rear wheel, there should be no difference in the reading, but if the sensor is on the front wheel, it will read about 0.3mph too slow (negligible).
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Even if it were on the front wheel there are other factors that will effect rolling diameter as much or more such as differences in tire inflation pressure and differnces in rolling patch shape due to different compounds used in tire and/or tread pattern.
Very few cars sold today have different speedometer calibrations for different sized wheels. Most just keep the rolling diameter the same for all available stock wheel sizes.