Quote:
Originally Posted by ChasVS
Calculate the rolling distance of the 19's vs the 17's and see how much farther you are actually traveling per revolution. The difference will probably be the amount you are seeing. Unless you can recalibrate the Odometer, you'll always be off. The Odometer thinks you have traveled X feet per revolution and you actually traveled Y. The difference between X & Y is the change you are experiencing all other things being equal.
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Makes sense, but when I used the wheel calculator on this site I was looking at under a 2% difference. So I'd expect the difference to be 2% or less...