Can't Get Enough
Join Date: Oct 2002
Location: Danville, Illinois
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New tire size / old tire size x the speed your speedometer says = actual speed.
That's how I figure mine. I just do the math while I drive, 90% efficient, so 30 is 27, 50 is 45, and so and and so forth. Of course you have to factor in gear changes too. And yes, it would be much easier to get a truspeed, but that costs money. [img]images/graemlins/smile.gif[/img]