What does 225/40R18 mean?
225/40R18 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.
- 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.
225/40R18 Tire Conversion
Dimensions | Inches | Millimeters |
Tire Diameter | 25.1 in | 637.2 mm |
Section Width | 8.9 in | 225 mm |
Rim Height | 18 in | 457 mm |
Sidewall Height | 3.5 in | 90 mm |
Circumference | 78.8 in | 2001.8 mm |
Revolutions | 803.9 revs/mile |
FAQ About 225/40R18 Tire
How tall is a 225/40R18 tire?
The height (or diameter) of a 225/40R18 tire is 25.1 inches
How wide is a 225/40R18 tire?
The width of a 225/40R18 tire is 225 mm, which is about 8.9 inches.
What size rim fits a 225/40R18 tire?
A 225/40R18 tire fits on a rim that is 18 inches in diameter.
What does the 40 in a 225/40R18 tire mean?
The 40 in a 225/40R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 40% of its width.
Alternative Tire Sizes for 225/40R18
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 225/40R18:
Tire Size | Diameter | Rim |
---|---|---|
125/70R18 | 24.9″ (-0.8%) | 18 x n/a |
135/60R18 | 24.4″ (-2.8%) | 18 x n/a |
135/70R18 | 25.4″ (1.2%) | 18 x n/a |
145/65R18 | 25.4″ (1.2%) | 18 x n/a |
155/60R18 | 25.3″ (0.8%) | 18 x n/a |
205/40R18 | 24.5″ (-2.4%) | 18 x 7.0-8.0 |
205/45R18 | 25.3″ (0.8%) | 18 x 6.5-7.5 |
215/40R18 | 24.8″ (-1.2%) | 18 x 7.0-8.5 |
215/45R18 | 25.6″ (2.0%) | 18 x 7.0-8.0 |
235/35R18 | 24.5″ (-2.4%) | 18 x 8.0-9.5 |
235/40R18 | 25.4″ (1.2%) | 18 x 8.0-9.5 |
245/35R18 | 24.8″ (-1.2%) | 18 x 8.0-9.5 |
245/40R18 | 25.7″ (2.4%) | 18 x 8.0-9.5 |
255/35R18 | 25.0″ (-0.4%) | 18 x 8.5-10.0 |
265/35R18 | 25.3″ (0.8%) | 18 x 9.0-10.5 |
275/35R18 | 25.6″ (2.0%) | 18 x 9.0-11.0 |
285/30R18 | 24.7″ (-1.6%) | 18 x 9.5-10.5 |
295/30R18 | 25.0″ (-0.4%) | 18 x 10.0-11.0 |
305/30R18 | 25.2″ (0.4%) | 18 x 10.5-11.5 |
315/30R18 | 25.4″ (1.2%) | 18 x 10.5-11.5 |