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Old 12-10-2012, 04:02 PM
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coax coax is offline
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Quote:
Originally Posted by nakman View Post
Stock tires on an 80 are 265 75, right?

265 75 r16 works out to 31.65" diameter. (265*.75*2*.03937) + 16

285 75 r16 works out to 32.83" diameter. (285*.75*2*.03937) + 16

32.83/31.65=1.037. Ok call it 1.04
Afaik stock tires are 275/70/16 which is about a 1/2 smaller than the 265's. Thats probably where the math is different. I need all the gas mileage numbers stacked in my favor when driving a heavy pig! Though I would guess its all academic really due to manufacturer variance, tire wear (could be almost up to 3/4 of an inch), etc.

265 75 r16 works out to 31.65" diameter. (265*.75*2*.03937) + 16 ] * pi = 99.43" circumference.
275 70 r16 works out to 31.15" diameter. (275*.75*2*.03937) + 16 ] * pi = 97.86"
285 75 r16 works out to 32.83" diameter. (285*.75*2*.03937) + 16 ] * pi = 103.1"
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