155/85R18 in Inches

A 155/85R18 tire has a 28.4-inch diameter, a 6.1-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 28.4x6.1R18.

155/85R18 Tire Size
6.1"
28.4"
155/85R18 Tire Size in Inches
155/85R18 Tire Circumference
89.1"
18"
5.2"
710.8 revs/mile

155/85R18 Tire Overview

Height
28.4 inches
Wheel Diameter
18 inches
Tire Width
6.1 inches
Circumference
89.1 inches
Sidewall Height
5.2 inches
Revolutions
710.8 per mile
Tirelib.com

What does 155/85R18 mean?

155/85R18 tire size meaning in inches

155/85R18 is a tire size with the following dimensions:

  • 155 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.
  • 85 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.

155/85R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter28.4 in720.7 mm
Section Width6.1 in155 mm
Rim Height18 in457 mm
Sidewall Height5.2 in131.8 mm
Circumference89.1 in2264.1 mm
Revolutions710.8 revs/mile
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FAQ About 155/85R18 Tire

How tall is a 155/85R18 tire?

The height (or diameter) of a 155/85R18 tire is 28.4 inches

How wide is a 155/85R18 tire?

The width of a 155/85R18 tire is 155 mm, which is about 6.1 inches.

What size rim fits a 155/85R18 tire?

A 155/85R18 tire fits on a rim that is 18 inches in diameter.

What does the 85 in a 155/85R18 tire mean?

The 85 in a 155/85R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 85% of its width.

Alternative Tire Sizes for 155/85R18

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 155/85R18:

Tire SizeDiameterRim
265/50R1828.4″ (Equal)18 x 7.5-9.5
145/85R1827.7″ (-2.5%)18 x n/a
155/80R1827.8″ (-2.1%)18 x n/a
155/90R1829.0″ (2.1%)18 x n/a
175/80R1829.0″ (2.1%)18 x n/a
205/60R1827.7″ (-2.5%)18 x 5.0-7.5
225/55R1827.7″ (-2.5%)18 x 6.0-8.0
225/60R1828.6″ (0.7%)18 x 6.0-8.0
235/55R1828.2″ (-0.7%)18 x 6.5-8.5
235/60R1829.1″ (2.5%)18 x 6.5-8.5
245/50R1827.6″ (-2.8%)18 x 7.0-8.5
245/55R1828.6″ (0.7%)18 x 7.0-8.5
255/50R1828.0″ (-1.4%)18 x 7.0-9.0
255/55R1829.0″ (2.1%)18 x 7.0-9.0
275/45R1827.7″ (-2.5%)18 x 8.5-10.5
275/50R1828.8″ (1.4%)18 x 7.5-9.5
285/45R1828.1″ (-1.1%)18 x 9.0-10.5
285/50R1829.2″ (2.8%)18 x 8.0-10.0
295/45R1828.5″ (0.4%)18 x 9.5-11.0
305/40R1827.6″ (-2.8%)18 x 10.0-12.0
305/45R1828.8″ (1.4%)18 x 9.5-11.5
315/40R1827.9″ (-1.8%)18 x 10.5-12.5