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Using the formula above, I figured my final drive as this
(rear gear) x (OD gear) = final drive
3.73 x 0.79 = 2.94 final drive
I have been thinking about a rear gear change and the math brings me....
3.45 x 0.79 = 2.73
and
3.27 x 0.79 = 2.58
What I don't know is how my new tire size affects this number.
My stock tires are:
225/70/15
approx. 27.5" diameter
approx. 745 rev / mile
The new ones are:
235/75/15
approx. 28.9" diameter (+5%)
approx. 710 rev / mile (-5%)
To figure the final drive with the new tire size do I adjust the stock final drive by that same 5% ?
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