275/45R21 in Inches

A 275/45R21 tire has a 30.7-inch diameter, a 10.8-inch width, and is designed for a 21-inch rim.

In high flotation terms, this tire is labeled as 30.7x10.8R21.

275/45R21 Tire Size
10.8"
30.7"
275/45R21 Tire Size in Inches
275/45R21 Tire Circumference
96.6"
21"
4.9"
656 revs/mile

275/45R21 Tire Overview

Height
30.7 inches
Wheel Diameter
21 inches
Tire Width
10.8 inches
Circumference
96.6 inches
Sidewall Height
4.9 inches
Revolutions
656 per mile
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What does 275/45R21 mean?

275/45R21 tire size meaning in inches

275/45R21 is a tire size with the following dimensions:

  • 275 is the width of the tire in millimeters. This number also indicates the appropriate width of the rim on which the tire should be mounted.
  • 45 is the aspect ratio, which is the ratio of the tire's height to its width. This affects the tire's handling and ride comfort
  • R indicates the tire's construction type, meaning it has a radial construction. This provides stability and precision to the tire.
  • 21 is the diameter of the wheel in inches, on which the tire is to be mounted.

275/45R21 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter30.7 in780.9 mm
Section Width10.8 in275 mm
Rim Height21 in533 mm
Sidewall Height4.9 in123.8 mm
Circumference96.6 in2453.3 mm
Revolutions656 revs/mile
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FAQ About 275/45R21 Tire

How tall is a 275/45R21 tire?

The height (or diameter) of a 275/45R21 tire is 30.7 inches

How wide is a 275/45R21 tire?

The width of a 275/45R21 tire is 275 mm, which is about 10.8 inches.

What size rim fits a 275/45R21 tire?

A 275/45R21 tire fits on a rim that is 21 inches in diameter.

What does the 45 in a 275/45R21 tire mean?

The 45 in a 275/45R21 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 45% of its width.


Alternative Tire Sizes for 275/45R21

Typically, it's recommended to choose a tire with a diameter (height) within 3% of the original equipment manufacturer (OEM) tire size.

However, keep in mind that this is a general guideline and not an absolute rule.

Here are some tire sizes that are compatible with the 275/45R21:

Tire SizeDiameterRim
255/45R2130.0″ (-2.3%)21 x 9.5-11.0
255/50R2131.0″ (1.0%)21 x 7.0-9.0
265/45R2130.4″ (-1.0%)21 x 8.5-10.0
285/40R2130.0″ (-2.3%)21 x 9.5-11.0
285/45R2131.1″ (1.3%)21 x 9.0-10.5
295/40R2130.3″ (-1.3%)21 x 10.0-11.5
315/40R2130.9″ (0.7%)21 x 10.5-12.5
325/40R2131.2″ (1.6%)21 x 11.0-13.0