275/55R21 in Inches

A 275/55R21 tire has a 32.9-inch diameter, a 10.8-inch width, and is designed for a 21-inch rim.

In high flotation terms, this tire is labeled as 32.9x10.8R21.

275/55R21 Tire Size
275/55R21 Tire Size in Inches
275/55R21 Tire Circumference
612.8 revs/mile

275/55R21 Tire Overview

32.9 inches
Wheel Diameter
21 inches
Tire Width
10.8 inches
103.4 inches
Sidewall Height
6 inches
612.8 per mile

What does 275/55R21 mean?

275/55R21 tire size meaning in inches

275/55R21 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.
  • 55 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.

275/55R21 Tire Conversion

Tire Diameter32.9 in835.9 mm
Section Width10.8 in275 mm
Rim Height21 in533 mm
Sidewall Height6 in151.3 mm
Circumference103.4 in2626.1 mm
Revolutions612.8 revs/mile
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FAQ About 275/55R21 Tire

How tall is a 275/55R21 tire?

The height (or diameter) of a 275/55R21 tire is 32.9 inches

How wide is a 275/55R21 tire?

The width of a 275/55R21 tire is 275 mm, which is about 10.8 inches.

What size rim fits a 275/55R21 tire?

A 275/55R21 tire fits on a rim that is 21 inches in diameter.

What does the 55 in a 275/55R21 tire mean?

The 55 in a 275/55R21 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 55% of its width.

Alternative Tire Sizes for 275/55R21

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 275/55R21:

Tire SizeDiameterRim
315/45R2132.2″ (-2.1%)21 x n/a