P305/55R20 in inches

How tall is a P305 55R20 tire?

When converted to inches, the equivalent of a P305/55R20 tire size is 33.2x12R20. It means that:

  • height overall (or diameter) is 33.2 inches
  • tread width is 12 inches
  • wheel diameter is 20 inches

Learn more

P305/55R20 tire size in inches
P305/55R20 tire size chart

P305/55R20 tire size in inches

P305/55R20 Height / overall diameter: 33.2 inches
Height / overall diameter
33.2 inches
P305/55R20 Tread width: 12 inches
Tread width
12 inches
P305/55R20 Sidewall: 6.6 inches
Sidewall
6.6 inches
P305/55R20 Wheel diameter: 20 inches
Wheel diameter
20 inches
P305/55R20 Circumference: 104.2 inches
Circumference
104.2 inches
P305/55R20 Revolutions: 608 per mile
Revolutions
608 per mile

P305/55R20 — what does it mean?

  • P means "passenger car"
  • 305 stands for tread width in millimeters
  • 55 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

P305/55R20 tire code
P305/55R20 tire code

How to convert P305 55R20 to inches?

First of all, we need to divide 305 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 12″. Then, 55% of the 12″ will result in 6.6″ 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 33.2″ total tire diameter (or height).

For your convenience, below is a table for P305/55R20 conversion to inches:

Inches Metric
Overall diameter (height) 33.2″ 843 mm
Tread width 12″ 305 mm
Wheel diameter 20″ 843 mm
Sidewall height 6.6″ 168 mm
Circumference 104.2″ 2647 mm
Revolutions 608 / ml 378 / km

Alternatives to a P305/55R20 tire

If you're looking to upsize your P305 55R20 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
305/55R20 33.2″ 0% 12″ 20″
LT305/55R20 33.2″ 0% 12″ 20″
275/65R20 34″ 0.62% 10.8″ 20″
LT275/65R20 34″ 0.62% 10.8″ 20″
275/60R20 33″ -0.15% 10.8″ 20″
285/55R20 32.4″ -0.6% 11.2″ 20″
LT285/55R20 32.4″ -0.6% 11.2″ 20″
295/55R20 32.8″ -0.3% 11.6″ 20″
285/60R20 33.4″ 0.15% 11.2″ 20″
295/60R20 34″ 0.62% 11.6″ 20″