from the scangauge II instruction manual on how to adjust your speed with different tire size...
The approximate % to use for a tire size
change can be computed by dividing the diameter of the original
equipment tire by the diameter of the new tire, subtract this from 1 and
multiply by 100. For instance, if the diameter of the original tires was 24
inches and the size of the new tire is 30 inches, 100x(1-(24/30)) = 20. (you are going 20% faster than what your speedo reads)
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