P285/60R18 in inches

How tall is a P285 60R18 tire?

When converted to inches, the equivalent of a P285/60R18 tire size is 31.4x11.2R18. It means that:

  • height overall (or diameter) is 31.4 inches
  • tread width is 11.2 inches
  • wheel diameter is 18 inches

Learn more

P285/60R18 tire size in inches
P285/60R18 tire size chart

P285/60R18 tire size in inches

P285/60R18 Height / overall diameter: 31.4 inches
Height / overall diameter
31.4 inches
P285/60R18 Tread width: 11.2 inches
Tread width
11.2 inches
P285/60R18 Sidewall: 6.7 inches
Sidewall
6.7 inches
P285/60R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
P285/60R18 Circumference: 98.6 inches
Circumference
98.6 inches
P285/60R18 Revolutions: 642 per mile
Revolutions
642 per mile

P285/60R18 — what does it mean?

  • P means "passenger car"
  • 285 stands for tread width in millimeters
  • 60 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

P285/60R18 tire code
P285/60R18 tire code

How to convert P285 60R18 to inches?

First of all, we need to divide 285 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 11.2″. Then, 60% of the 11.2″ will result in 6.7″ 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 31.4″ total tire diameter (or height).

For your convenience, below is a table for P285/60R18 conversion to inches:

Inches Metric
Overall diameter (height) 31.4″ 798 mm
Tread width 11.2″ 285 mm
Wheel diameter 18″ 798 mm
Sidewall height 6.7″ 171 mm
Circumference 98.6″ 2506 mm
Revolutions 642 / ml 399 / km

Alternatives to a P285/60R18 tire

If you're looking to upsize your P285 60R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
275/65R18 32″ 0.47% 10.8″ 18″
LT275/65R18 32″ 0.47% 10.8″ 18″
265/65R18 31.6″ 0.16% 10.4″ 18″
285/60R18 31.4″ 0% 11.2″ 18″
255/70R18 32″ 0.47% 10″ 18″
265/60R18 30.6″ -0.67% 10.4″ 18″
275/60R18 31″ -0.35% 10.8″ 18″
P255/70R18 32″ 0.47% 10″ 18″
255/65R18 31″ -0.35% 10″ 18″
235/70R18 31″ -0.35% 9.3″ 18″