225/65R18 in Inches

A 225/65R18 tire has a 29.5-inch diameter, a 8.9-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 29.5x8.9R18.

225/65R18 Tire Size
8.9"
29.5"
225/65R18 Tire Size in Inches
225/65R18 Tire Circumference
92.7"
18"
5.8"
683.3 revs/mile

225/65R18 Tire Overview

Height
29.5 inches
Wheel Diameter
18 inches
Tire Width
8.9 inches
Circumference
92.7 inches
Sidewall Height
5.8 inches
Revolutions
683.3 per mile
Tirelib.com

What does 225/65R18 mean?

225/65R18 tire size meaning in inches

225/65R18 is a tire size with the following dimensions:

  • 225 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.

225/65R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter29.5 in749.7 mm
Section Width8.9 in225 mm
Rim Height18 in457 mm
Sidewall Height5.8 in146.3 mm
Circumference92.7 in2355.3 mm
Revolutions683.3 revs/mile
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FAQ About 225/65R18 Tire

How tall is a 225/65R18 tire?

The height (or diameter) of a 225/65R18 tire is 29.5 inches

How wide is a 225/65R18 tire?

The width of a 225/65R18 tire is 225 mm, which is about 8.9 inches.

What size rim fits a 225/65R18 tire?

A 225/65R18 tire fits on a rim that is 18 inches in diameter.

What does the 65 in a 225/65R18 tire mean?

The 65 in a 225/65R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 65% of its width.


Alternative Tire Sizes for 225/65R18

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 225/65R18:

Tire SizeDiameterRim
265/55R1829.5″ (Equal)18 x 7.5-9.5
325/45R1829.5″ (Equal)18 x n/a
155/90R1829.0″ (-1.7%)18 x n/a
165/90R1829.7″ (0.7%)18 x n/a
175/80R1829.0″ (-1.7%)18 x n/a
235/60R1829.1″ (-1.4%)18 x 6.5-8.5
235/65R1830.0″ (1.7%)18 x 6.5-8.5
245/60R1829.6″ (0.3%)18 x 7.0-8.5
255/55R1829.0″ (-1.7%)18 x 7.0-9.0
255/60R1830.0″ (1.7%)18 x 7.0-9.0
275/50R1828.8″ (-2.4%)18 x 7.5-9.5
275/55R1829.9″ (1.4%)18 x 7.5-9.5
285/50R1829.2″ (-1.0%)18 x 8.0-10.0
285/55R1830.3″ (2.7%)18 x 8.0-10.0
305/45R1828.8″ (-2.4%)18 x 9.5-11.5