225/45R18 in Inches

A 225/45R18 tire has a 26-inch diameter, a 8.9-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 26x8.9R18.

225/45R18 Tire Size
8.9"
26"
225/45R18 Tire Size in Inches
225/45R18 Tire Circumference
81.6"
18"
4"
776.5 revs/mile

225/45R18 Tire Overview

Height
26 inches
Wheel Diameter
18 inches
Tire Width
8.9 inches
Circumference
81.6 inches
Sidewall Height
4 inches
Revolutions
776.5 per mile
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What does 225/45R18 mean?

225/45R18 tire size meaning in inches

225/45R18 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.
  • 45 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.

225/45R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter26 in659.7 mm
Section Width8.9 in225 mm
Rim Height18 in457 mm
Sidewall Height4 in101.3 mm
Circumference81.6 in2072.5 mm
Revolutions776.5 revs/mile
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FAQ About 225/45R18 Tire

How tall is a 225/45R18 tire?

The height (or diameter) of a 225/45R18 tire is 26 inches

How wide is a 225/45R18 tire?

The width of a 225/45R18 tire is 225 mm, which is about 8.9 inches.

What size rim fits a 225/45R18 tire?

A 225/45R18 tire fits on a rim that is 18 inches in diameter.

What does the 45 in a 225/45R18 tire mean?

The 45 in a 225/45R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 45% of its width.

Alternative Tire Sizes for 225/45R18

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 225/45R18:

Tire SizeDiameterRim
145/70R1826.0″ (Equal)18 x n/a
185/55R1826.0″ (Equal)18 x n/a
255/40R1826.0″ (Equal)18 x 8.5-10.0
135/70R1825.4″ (-2.3%)18 x n/a
135/80R1826.5″ (1.9%)18 x n/a
145/65R1825.4″ (-2.3%)18 x n/a
155/60R1825.3″ (-2.7%)18 x n/a
155/70R1826.5″ (1.9%)18 x n/a
205/45R1825.3″ (-2.7%)18 x 6.5-7.5
205/50R1826.1″ (0.4%)18 x n/a
215/45R1825.6″ (-1.5%)18 x 7.0-8.0
215/50R1826.5″ (1.9%)18 x 6.0-7.5
235/40R1825.4″ (-2.3%)18 x 8.0-9.5
235/45R1826.3″ (1.2%)18 x 7.5-9.0
245/40R1825.7″ (-1.2%)18 x 8.0-9.5
245/45R1826.7″ (2.7%)18 x 7.5-9.0
265/35R1825.3″ (-2.7%)18 x 9.0-10.5
265/40R1826.3″ (1.2%)18 x 9.0-10.5
275/35R1825.6″ (-1.5%)18 x 9.0-11.0
275/40R1826.7″ (2.7%)18 x 9.0-11.0
285/35R1825.9″ (-0.4%)18 x 9.5-11.0
295/35R1826.1″ (0.4%)18 x 10.0-11.5
305/35R1826.4″ (1.5%)18 x 10.0-12.0
315/30R1825.4″ (-2.3%)18 x 10.5-11.5
315/35R1826.7″ (2.7%)18 x 10.5-12.5
335/30R1825.9″ (-0.4%)18 x 11.5-12.5
345/30R1826.1″ (0.4%)18 x 12.0-14.0