P245/40R20 in inches

How tall is a P245 40R20 tire?

When converted to inches, the equivalent of a P245/40R20 tire size is 27.8x9.6R20. It means that:

  • height overall (or diameter) is 27.8 inches
  • tread width is 9.6 inches
  • wheel diameter is 20 inches

Learn more

P245/40R20 tire size in inches
P245/40R20 tire size chart

P245/40R20 tire size in inches

P245/40R20 Height / overall diameter: 27.8 inches
Height / overall diameter
27.8 inches
P245/40R20 Tread width: 9.6 inches
Tread width
9.6 inches
P245/40R20 Sidewall: 3.9 inches
Sidewall
3.9 inches
P245/40R20 Wheel diameter: 20 inches
Wheel diameter
20 inches
P245/40R20 Circumference: 87.3 inches
Circumference
87.3 inches
P245/40R20 Revolutions: 726 per mile
Revolutions
726 per mile

P245/40R20 — what does it mean?

  • P means "passenger car"
  • 245 stands for tread width in millimeters
  • 40 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 20 is a wheel diameter (or rim) in inches

P245/40R20 tire code
P245/40R20 tire code

How to convert P245 40R20 to inches?

First of all, we need to divide 245 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 9.6″. Then, 40% of the 9.6″ will result in 3.9″ sidewall.

To get the total height or tire diameter, we need to sum the 20″ rim diameter with two of the sidewall heights. It will result in a 27.8″ total tire diameter (or height).

For your convenience, below is a table for P245/40R20 conversion to inches:

Inches Metric
Overall diameter (height) 27.8″ 706 mm
Tread width 9.6″ 245 mm
Wheel diameter 20″ 706 mm
Sidewall height 3.9″ 98 mm
Circumference 87.3″ 2217 mm
Revolutions 726 / ml 451 / km

Alternatives to a P245/40R20 tire

If you're looking to upsize your P245 40R20 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
305/35R20 28.4″ 0.53% 12″ 20″
255/35R20 27″ -0.72% 10″ 20″
245/40R20 27.8″ 0% 9.6″ 20″
295/35R20 28.2″ 0.35% 11.6″ 20″
285/35R20 27.8″ 0% 11.2″ 20″
275/35R20 27.6″ -0.18% 10.8″ 20″
155/60R20 27.4″ -0.36% 6.1″ 20″
T165/60R20 27.8″ 0% 6.5″ 20″
175/55R20 27.6″ -0.18% 6.9″ 20″
195/50R20 27.8″ 0% 7.7″ 20″