245/40R18 in Inches

A 245/40R18 tire has a 25.7-inch diameter, a 9.6-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 25.7x9.6R18.

245/40R18 Tire Size
9.6"
25.7"
245/40R18 Tire Size in Inches
245/40R18 Tire Circumference
80.8"
18"
3.9"
784.2 revs/mile

245/40R18 Tire Overview

Height
25.7 inches
Wheel Diameter
18 inches
Tire Width
9.6 inches
Circumference
80.8 inches
Sidewall Height
3.9 inches
Revolutions
784.2 per mile
Tirelib.com

What does 245/40R18 mean?

245/40R18 tire size meaning in inches

245/40R18 is a tire size with the following dimensions:

  • 245 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.
  • 40 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.

245/40R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter25.7 in653.2 mm
Section Width9.6 in245 mm
Rim Height18 in457 mm
Sidewall Height3.9 in98 mm
Circumference80.8 in2052.1 mm
Revolutions784.2 revs/mile
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FAQ About 245/40R18 Tire

How tall is a 245/40R18 tire?

The height (or diameter) of a 245/40R18 tire is 25.7 inches

How wide is a 245/40R18 tire?

The width of a 245/40R18 tire is 245 mm, which is about 9.6 inches.

What size rim fits a 245/40R18 tire?

A 245/40R18 tire fits on a rim that is 18 inches in diameter.

What does the 40 in a 245/40R18 tire mean?

The 40 in a 245/40R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 40% of its width.


Alternative Tire Sizes for 245/40R18

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 245/40R18:

Tire SizeDiameterRim
135/70R1825.4″ (-1.2%)18 x n/a
145/65R1825.4″ (-1.2%)18 x n/a
145/70R1826.0″ (1.2%)18 x n/a
155/60R1825.3″ (-1.6%)18 x n/a
185/55R1826.0″ (1.2%)18 x n/a
205/45R1825.3″ (-1.6%)18 x 6.5-7.5
205/50R1826.1″ (1.6%)18 x n/a
215/45R1825.6″ (-0.4%)18 x 7.0-8.0
225/40R1825.1″ (-2.3%)18 x 7.5-9.0
225/45R1826.0″ (1.2%)18 x 7.0-8.5
235/40R1825.4″ (-1.2%)18 x 8.0-9.5
235/45R1826.3″ (2.3%)18 x 7.5-9.0
255/35R1825.0″ (-2.7%)18 x 8.5-10.0
255/40R1826.0″ (1.2%)18 x 8.5-10.0
265/35R1825.3″ (-1.6%)18 x 9.0-10.5
265/40R1826.3″ (2.3%)18 x 9.0-10.5
275/35R1825.6″ (-0.4%)18 x 9.0-11.0
285/35R1825.9″ (0.8%)18 x 9.5-11.0
295/30R1825.0″ (-2.7%)18 x 10.0-11.0
295/35R1826.1″ (1.6%)18 x 10.0-11.5
305/30R1825.2″ (-1.9%)18 x 10.5-11.5
305/35R1826.4″ (2.7%)18 x 10.0-12.0
315/30R1825.4″ (-1.2%)18 x 10.5-11.5
335/30R1825.9″ (0.8%)18 x 11.5-12.5
345/30R1826.1″ (1.6%)18 x 12.0-14.0