235/55R20 tire size

A 235/55R20 tire is 30.18 in (766.5 mm) tall and 9.25 in (235.0 mm) wide, and turns 668 revolutions per mile.

235/55R20 dimensions
MeasurementInchesMillimeters
Overall diameter30.18 in766.5 mm
Section width9.25 in235.0 mm
Sidewall height5.09 in129.3 mm
Rim diameter20.00 in508.0 mm
Circumference94.80 in2,408 mm
Revolutions per mile668
Flotation equivalent30.2x9.3R20 (approx.)

235/55R20 is a 20-inch tire with a 235 mm (9.25 in) section width and a 55% aspect ratio, giving a 5.09-inch sidewall and a flotation-style size of about 30.2x9.3R20.

Its overall diameter is 30.18 inches, so it rolls 94.8 inches per revolution and turns about 668 times per mile.

75 other sizes in this list are within 3% of that diameter.

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Sizes within 3% of 30.18 in diameter

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.