255/40R17 tire size

A 255/40R17 tire is 25.03 in (635.8 mm) tall and 10.04 in (255.0 mm) wide, and turns 806 revolutions per mile.

255/40R17 dimensions
MeasurementInchesMillimeters
Overall diameter25.03 in635.8 mm
Section width10.04 in255.0 mm
Sidewall height4.02 in102.0 mm
Rim diameter17.00 in431.8 mm
Circumference78.64 in1,997 mm
Revolutions per mile806
Flotation equivalent25.0x10.0R17 (approx.)

255/40R17 is a 17-inch tire with a 255 mm (10.04 in) section width and a 40% aspect ratio, giving a 4.02-inch sidewall and a flotation-style size of about 25.0x10.0R17.

Its overall diameter is 25.03 inches, so it rolls 78.6 inches per revolution and turns about 806 times per mile.

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

Compare 255/40R17 with plausible swaps

Sizes within 3% of 25.03 in diameter

Open 255/40R17 in the tire size calculator

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