275/55R21 in inches

How tall is a 275 55R21 tire?

When converted to inches, the equivalent of a 275/55R21 tire size is 32.8x10.8R21. It means that:

  • height overall (or diameter) is 32.8 inches
  • tread width is 10.8 inches
  • wheel diameter is 21 inches

Learn more

275/55R21 tire size in inches
275/55R21 tire size chart

275/55R21 tire size in inches

275/55R21 Height / overall diameter: 32.8 inches
Height / overall diameter
32.8 inches
275/55R21 Tread width: 10.8 inches
Tread width
10.8 inches
275/55R21 Sidewall: 5.9 inches
5.9 inches
275/55R21 Wheel diameter: 21 inches
Wheel diameter
21 inches
275/55R21 Circumference: 103 inches
103 inches
275/55R21 Revolutions: 615 per mile
615 per mile

275/55R21 — what does it mean?

  • 275 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
  • 21 is a wheel diameter (or rim) in inches

275/55R21 tire code
275/55R21 tire code

How to convert 275 55R21 to inches?

First of all, we need to divide 275 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 10.8″. Then, 55% of the 10.8″ will result in 5.9″ sidewall.

To get the total height or tire diameter, we need to sum the 21″ rim diameter with two of the sidewall heights. It will result in a 32.8″ total tire diameter (or height).

For your convenience, below is a table for 275/55R21 conversion to inches:

Inches Metric
Overall diameter (height) 32.8″ 833 mm
Tread width 10.8″ 275 mm
Wheel diameter 21″ 833 mm
Sidewall height 5.9″ 151 mm
Circumference 103″ 2616 mm
Revolutions 615 / ml 382 / km

Alternatives to a 275/55R21 tire

If you're looking to upsize your 275 55R21 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
275/50R21 31.8″ -0.76% 10.8″ 21″
315/45R21 32.2″ -0.45% 12.4″ 21″