Join Date: Dec 2010
Location: Portland, OR
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There's a simple formula which converts metric tire sizes into their diameter in inches. It is as follows:
Section Width * Profile / 1270 + Wheel Diameter = Diameter in inches
Therefore, for a 285/75/17 tire,
285 * 75 / 1270 + 17 = 33.83"
As mentioned by the gentleman above, there will be some variability in the actual measurement, depending on the tire.
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Last edited by TheAlmightySam; 11-04-2011 at 08:28 PM.