255/70R18 in inches

How tall is a 255 70R18 tire?

When converted to inches, the equivalent of a 255/70R18 tire size is 32x10R18. It means that:

  • height overall (or diameter) is 32 inches
  • tread width is 10 inches
  • wheel diameter is 18 inches

Learn more

255/70R18 tire size in inches
255/70R18 tire size chart

255/70R18 tire size in inches

255/70R18 Height / overall diameter: 32 inches
Height / overall diameter
32 inches
255/70R18 Tread width: 10 inches
Tread width
10 inches
255/70R18 Sidewall: 7 inches
Sidewall
7 inches
255/70R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
255/70R18 Circumference: 100.5 inches
Circumference
100.5 inches
255/70R18 Revolutions: 631 per mile
Revolutions
631 per mile

255/70R18 — what does it mean?

  • 255 stands for tread width in millimeters
  • 70 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 18 is a wheel diameter (or rim) in inches

255/70R18 tire code
255/70R18 tire code

How to convert 255 70R18 to inches?

First of all, we need to divide 255 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 10″. Then, 70% of the 10″ will result in 7″ sidewall.

To get the total height or tire diameter, we need to sum the 18″ rim diameter with two of the sidewall heights. It will result in a 32″ total tire diameter (or height).

For your convenience, below is a table for 255/70R18 conversion to inches:

Inches Metric
Overall diameter (height) 32″ 813 mm
Tread width 10″ 255 mm
Wheel diameter 18″ 813 mm
Sidewall height 7″ 179 mm
Circumference 100.5″ 2553 mm
Revolutions 631 / ml 392 / km

Alternatives to a 255/70R18 tire

If you're looking to upsize your 255 70R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
275/65R18 32″ 0% 10.8″ 18″
LT275/65R18 32″ 0% 10.8″ 18″
LT285/65R18 32.6″ 0.46% 11.2″ 18″
285/65R18 32.6″ 0.46% 11.2″ 18″
265/65R18 31.6″ -0.31% 10.4″ 18″
285/60R18 31.4″ -0.47% 11.2″ 18″
265/70R18 32.6″ 0.46% 10.4″ 18″
305/60R18 32.4″ 0.31% 12″ 18″
P255/70R18 32″ 0% 10″ 18″
255/65R18 31″ -0.81% 10″ 18″