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FJ40Trevor said:

Why is this inaccurate? I think it would be more accurate to take into account the sidewall flex instead of the "ideal" diameter of the tire with no loads on it.

Either way, I agree with everyone else, 33" is close enough.
well if you want to be super accurate, you would find the actual CIRCUMFRANCE and go from there

if you squish a circle into an elipse then mesure diagonloy thru the center you will allways get a diferent mesurement .

also keep in mind, new mud tires are generaly 1-2" taller than a bald tire....
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