275/65R18 in Inches

A 275/65R18 tire has a 32.1-inch diameter, a 10.8-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 32.1x10.8R18.

275/65R18 Tire Size
10.8"
32.1"
275/65R18 Tire Size in Inches
275/65R18 Tire Circumference
100.8"
18"
7"
628.8 revs/mile

275/65R18 Tire Overview

Height
32.1 inches
Wheel Diameter
18 inches
Tire Width
10.8 inches
Circumference
100.8 inches
Sidewall Height
7 inches
Revolutions
628.8 per mile
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What does 275/65R18 mean?

275/65R18 tire size meaning in inches

275/65R18 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.
  • 65 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.
  • 18 is the diameter of the wheel in inches, on which the tire is to be mounted.

275/65R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter32.1 in814.7 mm
Section Width10.8 in275 mm
Rim Height18 in457 mm
Sidewall Height7 in178.8 mm
Circumference100.8 in2559.5 mm
Revolutions628.8 revs/mile
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FAQ About 275/65R18 Tire

How tall is a 275/65R18 tire?

The height (or diameter) of a 275/65R18 tire is 32.1 inches

How wide is a 275/65R18 tire?

The width of a 275/65R18 tire is 275 mm, which is about 10.8 inches.

What size rim fits a 275/65R18 tire?

A 275/65R18 tire fits on a rim that is 18 inches in diameter.

What does the 65 in a 275/65R18 tire mean?

The 65 in a 275/65R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 65% of its width.


Alternative Tire Sizes for 275/65R18

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 275/65R18:

Tire SizeDiameterRim
255/70R1832.1″ (Equal)18 x 6.5-8.5
225/75R1831.3″ (-2.5%)18 x n/a
235/75R1831.9″ (-0.6%)18 x n/a
245/70R1831.5″ (-1.9%)18 x n/a
245/75R1832.5″ (1.2%)18 x 6.5-8.0
265/65R1831.6″ (-1.6%)18 x 7.5-9.5
265/70R1832.6″ (1.6%)18 x 7.0-9.0
285/60R1831.5″ (-1.9%)18 x 8.0-10.0
285/65R1832.6″ (1.6%)18 x 8.0-10.0
305/60R1832.4″ (0.9%)18 x 8.5-11.0
375/50R1832.8″ (2.2%)18 x n/a