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rim has no damn effect on it at all. and there is not perfect number. each tire is different, differnt air pressure, load...
best bet is do this
make a mark on your tire, and a mark on the ground in line with the mark on your tire. rotate your tire three revolutions forward and measure. divide by three. this is your cicumference.
if your tire was a true 37" it would be approx 116-117" this would mean your tire makes approx 546 revs.
you figure this number by going like this, a mile is 5280 feet, or 63360 inches. your tire covers 116" in 1 rotation, so divide 63360 by 116 and that is how many revs per mile. my 37's measured 35.4, so i got 565 revs per mile.
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2008 Ford F-250 CC SB
Dark Pearl Blue(complete repaint under warranty)
6" Stage II Pro Comp Lift
17x9 Pro Comp 7189
37x12.5 Pro Comp Xtreme Mud Terrains
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