What is the tire circumference?

1 Answers
MacAbel
07/30/25 6:08am
Section width × aspect ratio × 2 + rim size (inches) × 25.4) × 3.14 = tire circumference. The original tire specification is 235/75R15. A. 235 indicates the tire width, which means the contact width between the tire and the surface is 23.5 centimeters. B. 75 represents the aspect ratio, which is 75%. This means the sidewall height/tire width = 75%. The sidewall height is the distance from the tire surface to the wheel hub, which can be calculated as 23.5 × 75% = 17.625 centimeters. C. 15 indicates a 15-inch wheel hub. Since 1 inch equals 2.54 centimeters, the diameter of a 15-inch wheel hub is 15 × 2.54 = 38.1 centimeters. Therefore, the diameter of a 235/75R15 tire can be calculated as 2B + C = 17.625 × 2 + 38.1 = 73.35 cm.
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