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Refer to the chart below to
determine the diameter of a tire.		 Tire Size Chart
 (15" Wheels)

Aspect Ratio

Formula
(Width x Aspect Ratio x 2) ÷ 25.4 + 15

Example:  205/60R15
(205 x .60 x 2) ÷ 25.4 + 15 = 24.69
 
Width of tire
in millimeters		 35 40 45 50 55 60 65 70 75 80 Width of tire
in inches

To convert from millimeters to inches, divide by 25.4.

Tire Diameter

Download Excel Chart
WOTSRA - Wheels of Time Street Rod Association Events