275/55R20 tire size

A 275/55R20 tire is 31.91 in (810.5 mm) tall and 10.83 in (275.0 mm) wide, and turns 632 revolutions per mile.

275/55R20 dimensions
MeasurementInchesMillimeters
Overall diameter31.91 in810.5 mm
Section width10.83 in275.0 mm
Sidewall height5.95 in151.3 mm
Rim diameter20.00 in508.0 mm
Circumference100.25 in2,546 mm
Revolutions per mile632
Flotation equivalent31.9x10.8R20 (approx.)

275/55R20 is a 20-inch tire with a 275 mm (10.83 in) section width and a 55% aspect ratio, giving a 5.95-inch sidewall and a flotation-style size of about 31.9x10.8R20.

Its overall diameter is 31.91 inches, so it rolls 100.2 inches per revolution and turns about 632 times per mile.

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

Compare 275/55R20 with plausible swaps

Sizes within 3% of 31.91 in diameter

Open 275/55R20 in the tire size calculator

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