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|6.4 Exterior Discussion Body and Accessories Talk|
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Width x Ratio = Section HeightSo, for a 325/65R18 tire, you would do the following,
Section Height x 2 = Total Section Height
Total Section Height + Wheel Diameter = Tire Diameter
325 * .65 = 211.25 mmRemember, convert your wheel diameter to mm by multiplying by 25.4 and convert the total mm back to inches by dividing by 25.4 which you can see I've done in the formula above.
211.25 * 2 = 422.5mm
422.5 + (18*25.4) = 879.7/25.4 = 34.63"