What does 245/40R18 mean?
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
Dimensions | Inches | Millimeters |
Tire Diameter | 25.7 in | 653.2 mm |
Section Width | 9.6 in | 245 mm |
Rim Height | 18 in | 457 mm |
Sidewall Height | 3.9 in | 98 mm |
Circumference | 80.8 in | 2052.1 mm |
Revolutions | 784.2 revs/mile |
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 Size | Diameter | Rim |
---|---|---|
135/70R18 | 25.4″ (-1.2%) | 18 x n/a |
145/65R18 | 25.4″ (-1.2%) | 18 x n/a |
145/70R18 | 26.0″ (1.2%) | 18 x n/a |
155/60R18 | 25.3″ (-1.6%) | 18 x n/a |
185/55R18 | 26.0″ (1.2%) | 18 x n/a |
205/45R18 | 25.3″ (-1.6%) | 18 x 6.5-7.5 |
205/50R18 | 26.1″ (1.6%) | 18 x n/a |
215/45R18 | 25.6″ (-0.4%) | 18 x 7.0-8.0 |
225/40R18 | 25.1″ (-2.3%) | 18 x 7.5-9.0 |
225/45R18 | 26.0″ (1.2%) | 18 x 7.0-8.5 |
235/40R18 | 25.4″ (-1.2%) | 18 x 8.0-9.5 |
235/45R18 | 26.3″ (2.3%) | 18 x 7.5-9.0 |
255/35R18 | 25.0″ (-2.7%) | 18 x 8.5-10.0 |
255/40R18 | 26.0″ (1.2%) | 18 x 8.5-10.0 |
265/35R18 | 25.3″ (-1.6%) | 18 x 9.0-10.5 |
265/40R18 | 26.3″ (2.3%) | 18 x 9.0-10.5 |
275/35R18 | 25.6″ (-0.4%) | 18 x 9.0-11.0 |
285/35R18 | 25.9″ (0.8%) | 18 x 9.5-11.0 |
295/30R18 | 25.0″ (-2.7%) | 18 x 10.0-11.0 |
295/35R18 | 26.1″ (1.6%) | 18 x 10.0-11.5 |
305/30R18 | 25.2″ (-1.9%) | 18 x 10.5-11.5 |
305/35R18 | 26.4″ (2.7%) | 18 x 10.0-12.0 |
315/30R18 | 25.4″ (-1.2%) | 18 x 10.5-11.5 |
335/30R18 | 25.9″ (0.8%) | 18 x 11.5-12.5 |
345/30R18 | 26.1″ (1.6%) | 18 x 12.0-14.0 |