255/65R18 in Inches

Tire size 255/65R18 refers to the tire size in numbers and letters such as the first number “255” indicates the tire width in millimeters, the second number “65” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 255/65R18 tire in inches can be described as a tire with a width of about 10 inches, a sidewall height of about 6.5 inches, and it fits on a 18-inch wheel.

Converting 255/65R18 in Inches

255/65R18 inches mm
Tire Diameter 31.1 inches 789 mm
Tread Width 10 inches 255 mm
Rim Diameter 18 inches 457 mm
Sidewall Height 6.5 inches 166 mm
Circumference 97.7 inches 2477 mm
Revolutions 649 per mile 404 per km

Tire Size Calculator

The Tire Size Calculator is a convenient online tool that helps determine the correct tire dimensions for a vehicle, ensuring optimal performance and compatibility.

Tire Diameter
Tread Width
Rim Diameter
Sidewall Height
Circumference
Revolutions

255/65R18 Alternate Tire Size

Tire Size Overall Diameter Difference
235/55R20 30.2″ (766 mm) -2.9%
285/55R18 30.4″ (771 mm) -2.3%
175/90R18 30.4″ (773 mm) -2%
295/45R20 30.5″ (774 mm) -1.9%
265/50R20 30.5″ (774 mm) -1.9%
265/55R19 30.5″ (775 mm) -1.8%
265/60R18 30.5″ (775 mm) -1.8%
245/65R18 30.5″ (775 mm) -1.8%
165/90R19 30.7″ (781 mm) -1%
305/45R20 30.8″ (782 mm) -0.9%
275/50R20 30.9″ (784 mm) -0.6%
275/55R19 30.9″ (785 mm) -0.5%
275/60R18 31″ (787 mm) -0.3%
235/70R18 31″ (787 mm) -0.3%
255/55R20 31″ (788 mm) -0.1%
255/60R19 31.1″ (789 mm) 0%
235/65R19 31.1″ (789 mm) 0%
285/50R20 31.3″ (794 mm) 0.6%
225/75R18 31.3″ (795 mm) 0.8%
285/55R19 31.4″ (797 mm) 1%
285/60R18 31.5″ (799 mm) 1.3%
265/65R18 31.5″ (801 mm) 1.5%
245/70R18 31.5″ (801 mm) 1.5%
245/60R20 31.6″ (802 mm) 1.6%
295/50R20 31.7″ (804 mm) 1.9%
235/75R18 31.9″ (809 mm) 2.5%
275/55R20 31.9″ (810 mm) 2.7%
225/70R19.5 31.9″ (811 mm) 2.8%

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