What does 255/45R18 mean?
255/45R18 is a tire size with the following dimensions:
- 255 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.
255/45R18 Tire Conversion
Dimensions | Inches | Millimeters |
Tire Diameter | 27 in | 686.7 mm |
Section Width | 10 in | 255 mm |
Rim Height | 18 in | 457 mm |
Sidewall Height | 4.5 in | 114.8 mm |
Circumference | 84.9 in | 2157.3 mm |
Revolutions | 746 revs/mile |
FAQ About 255/45R18 Tire
How tall is a 255/45R18 tire?
The height (or diameter) of a 255/45R18 tire is 27 inches
How wide is a 255/45R18 tire?
The width of a 255/45R18 tire is 255 mm, which is about 10 inches.
What size rim fits a 255/45R18 tire?
A 255/45R18 tire fits on a rim that is 18 inches in diameter.
What does the 45 in a 255/45R18 tire mean?
The 45 in a 255/45R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 45% of its width.
Alternative Tire Sizes for 255/45R18
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 255/45R18:
Tire Size | Diameter | Rim |
---|---|---|
285/40R18 | 27.0″ (Equal) | 18 x 9.5-11.0 |
325/35R18 | 27.0″ (Equal) | 18 x 11.0-13.0 |
135/80R18 | 26.5″ (-1.9%) | 18 x n/a |
145/80R18 | 27.1″ (0.4%) | 18 x n/a |
145/85R18 | 27.7″ (2.6%) | 18 x n/a |
155/70R18 | 26.5″ (-1.9%) | 18 x n/a |
155/80R18 | 27.8″ (3.0%) | 18 x n/a |
165/70R18 | 27.1″ (0.4%) | 18 x n/a |
205/55R18 | 26.9″ (-0.4%) | 18 x 5.5-7.5 |
205/60R18 | 27.7″ (2.6%) | 18 x 5.0-7.5 |
215/50R18 | 26.5″ (-1.9%) | 18 x 6.0-7.5 |
215/55R18 | 27.3″ (1.1%) | 18 x 6.0-7.5 |
225/50R18 | 26.9″ (-0.4%) | 18 x 6.0-8.0 |
225/55R18 | 27.7″ (2.6%) | 18 x 6.0-8.0 |
235/45R18 | 26.3″ (-2.6%) | 18 x 7.5-9.0 |
235/50R18 | 27.3″ (1.1%) | 18 x 6.5-8.5 |
245/45R18 | 26.7″ (-1.1%) | 18 x 7.5-9.0 |
245/50R18 | 27.6″ (2.2%) | 18 x 7.0-8.5 |
265/40R18 | 26.3″ (-2.6%) | 18 x 9.0-10.5 |
265/45R18 | 27.4″ (1.5%) | 18 x 8.5-10.0 |
275/40R18 | 26.7″ (-1.1%) | 18 x 9.0-11.0 |
275/45R18 | 27.7″ (2.6%) | 18 x 8.5-10.5 |
295/40R18 | 27.3″ (1.1%) | 18 x 10.0-11.5 |
305/35R18 | 26.4″ (-2.2%) | 18 x 10.0-12.0 |
305/40R18 | 27.6″ (2.2%) | 18 x 10.0-12.0 |
315/35R18 | 26.7″ (-1.1%) | 18 x 10.5-12.5 |
335/35R18 | 27.2″ (0.7%) | 18 x n/a |
345/35R18 | 27.5″ (1.9%) | 18 x 11.5-13.5 |