Thread: tire size?
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Old Tue, July 28th, 2009, 09:12 PM
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Jackpine Jackpine is offline
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Originally Posted by jrthomas15 View Post
Hey I know you guys get this question alot but i just want to make sure i get the right number. Whats the correct number for 35x12.5x18? I'm not sure about the squish and that stuff. Thanks guys
OK, A 35 inch diameter tire is 889mm in diameter: 35 x 25.4 = 889

Multiply that by pi: 889 x 3.141593 = 2792.9mm and that is the unloaded circumference.

Assume about 3% reduction for "squish": 2792.9 x 0.03 = 83.8mm we need to subtract.

So, 2792.9 - 83.8 = 2709mm. This is the rounded figure for Tire Size that I'd start out with. Adjust from there.

- Jack
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