P145/80R12 in inches

How tall is a P145 80R12 tire?

When converted to inches, the equivalent of a P145/80R12 tire size is 21.2x5.7R12. It means that:

  • height overall (or diameter) is 21.2 inches
  • tread width is 5.7 inches
  • wheel diameter is 12 inches

Learn more

P145/80R12 tire size in inches
P145/80R12 tire size chart

P145/80R12 tire size in inches

P145/80R12 Height / overall diameter: 21.2 inches
Height / overall diameter
21.2 inches
P145/80R12 Tread width: 5.7 inches
Tread width
5.7 inches
P145/80R12 Sidewall: 4.6 inches
4.6 inches
P145/80R12 Wheel diameter: 12 inches
Wheel diameter
12 inches
P145/80R12 Circumference: 66.6 inches
66.6 inches
P145/80R12 Revolutions: 953 per mile
953 per mile

P145/80R12 — what does it mean?

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

P145/80R12 tire code
P145/80R12 tire code

How to convert P145 80R12 to inches?

First of all, we need to divide 145 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 5.7″. Then, 80% of the 5.7″ will result in 4.6″ sidewall.

To get the total height or tire diameter, we need to sum the 12″ rim diameter with two of the sidewall heights. It will result in a 21.2″ total tire diameter (or height).

For your convenience, below is a table for P145/80R12 conversion to inches:

Inches Metric
Overall diameter (height) 21.2″ 538 mm
Tread width 5.7″ 145 mm
Wheel diameter 12″ 538 mm
Sidewall height 4.6″ 116 mm
Circumference 66.6″ 1689 mm
Revolutions 953 / ml 592 / km

Alternatives to a P145/80R12 tire

If you're looking to upsize your P145 80R12 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
145/80R12 21.2″ 0% 5.7″ 12″
155/80R12 21.8″ 0.73% 6.1″ 12″
165/70R12 21.2″ 0% 6.5″ 12″
P155/80R12 21.8″ 0.73% 6.1″ 12″