165/90R18 in Inches

A 165/90R18 tire has a 29.7-inch diameter, a 6.5-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 29.7x6.5R18.

165/90R18 Tire Size
165/90R18 Tire Size in Inches
165/90R18 Tire Circumference
679.2 revs/mile

165/90R18 Tire Overview

29.7 inches
Wheel Diameter
18 inches
Tire Width
6.5 inches
93.3 inches
Sidewall Height
5.8 inches
679.2 per mile

What does 165/90R18 mean?

165/90R18 tire size meaning in inches

165/90R18 is a tire size with the following dimensions:

  • 165 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.
  • 90 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.

165/90R18 Tire Conversion

Tire Diameter29.7 in754.2 mm
Section Width6.5 in165 mm
Rim Height18 in457 mm
Sidewall Height5.8 in148.5 mm
Circumference93.3 in2369.4 mm
Revolutions679.2 revs/mile
Not the tire size you are searching for? Try our Tire Size Calculator.

FAQ About 165/90R18 Tire

How tall is a 165/90R18 tire?

The height (or diameter) of a 165/90R18 tire is 29.7 inches

How wide is a 165/90R18 tire?

The width of a 165/90R18 tire is 165 mm, which is about 6.5 inches.

What size rim fits a 165/90R18 tire?

A 165/90R18 tire fits on a rim that is 18 inches in diameter.

What does the 90 in a 165/90R18 tire mean?

The 90 in a 165/90R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 90% of its width.

Alternative Tire Sizes for 165/90R18

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 165/90R18:

Tire SizeDiameterRim
155/90R1829.0″ (-2.4%)18 x n/a
175/80R1829.0″ (-2.4%)18 x n/a
175/90R1830.4″ (2.4%)18 x n/a
225/65R1829.5″ (-0.7%)18 x 6.0-8.0
235/60R1829.1″ (-2.0%)18 x 6.5-8.5
235/65R1830.0″ (1.0%)18 x 6.5-8.5
245/60R1829.6″ (-0.3%)18 x 7.0-8.5
245/65R1830.5″ (2.7%)18 x 7.0-8.5
255/55R1829.0″ (-2.4%)18 x 7.0-9.0
255/60R1830.0″ (1.0%)18 x 7.0-9.0
265/55R1829.5″ (-0.7%)18 x 7.5-9.5
265/60R1830.5″ (2.7%)18 x 7.5-9.5
275/55R1829.9″ (0.7%)18 x 7.5-9.5
285/50R1829.2″ (-1.7%)18 x 8.0-10.0
285/55R1830.3″ (2.0%)18 x 8.0-10.0
325/45R1829.5″ (-0.7%)18 x n/a