255/60R18 tire size

A 255/60R18 tire is 30.05 in (763.2 mm) tall and 10.04 in (255.0 mm) wide, and turns 671 revolutions per mile.

255/60R18 dimensions
MeasurementInchesMillimeters
Overall diameter30.05 in763.2 mm
Section width10.04 in255.0 mm
Sidewall height6.02 in153.0 mm
Rim diameter18.00 in457.2 mm
Circumference94.40 in2,398 mm
Revolutions per mile671
Flotation equivalent30.0x10.0R18 (approx.)

255/60R18 is a 18-inch tire with a 255 mm (10.04 in) section width and a 60% aspect ratio, giving a 6.02-inch sidewall and a flotation-style size of about 30.0x10.0R18.

Its overall diameter is 30.05 inches, so it rolls 94.4 inches per revolution and turns about 671 times per mile.

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

Compare 255/60R18 with plausible swaps

Sizes within 3% of 30.05 in diameter

Open 255/60R18 in the tire size calculator

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