What does 175/80R18 mean?
175/80R18 is a tire size with the following dimensions:
- 175 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.
- 80 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.
175/80R18 Tire Conversion
| Dimensions | Inches | Millimeters |
| Tire Diameter | 29 in | 737.2 mm |
| Section Width | 6.9 in | 175 mm |
| Rim Height | 18 in | 457 mm |
| Sidewall Height | 5.5 in | 140 mm |
| Circumference | 91.2 in | 2316 mm |
| Revolutions | 694.9 revs/mile | |
Not the tire size you are searching for? Try our Tire Size Calculator.
FAQ About 175/80R18 Tire
How tall is a 175/80R18 tire?
The height (or diameter) of a 175/80R18 tire is 29 inches
How wide is a 175/80R18 tire?
The width of a 175/80R18 tire is 175 mm, which is about 6.9 inches.
What size rim fits a 175/80R18 tire?
A 175/80R18 tire fits on a rim that is 18 inches in diameter.
What does the 80 in a 175/80R18 tire mean?
The 80 in a 175/80R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 80% of its width.
Alternative Tire Sizes for 175/80R18
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 175/80R18:
| Tire Size | Diameter | Rim |
|---|---|---|
| 155/90R18 | 29.0″ (Equal) | 18 x n/a |
| 255/55R18 | 29.0″ (Equal) | 18 x 7.0-9.0 |
| 155/85R18 | 28.4″ (-2.1%) | 18 x n/a |
| 165/90R18 | 29.7″ (2.4%) | 18 x n/a |
| 225/60R18 | 28.6″ (-1.4%) | 18 x 6.0-8.0 |
| 225/65R18 | 29.5″ (1.7%) | 18 x 6.0-8.0 |
| 235/55R18 | 28.2″ (-2.8%) | 18 x 6.5-8.5 |
| 235/60R18 | 29.1″ (0.3%) | 18 x 6.5-8.5 |
| 245/55R18 | 28.6″ (-1.4%) | 18 x 7.0-8.5 |
| 245/60R18 | 29.6″ (2.1%) | 18 x 7.0-8.5 |
| 265/50R18 | 28.4″ (-2.1%) | 18 x 7.5-9.5 |
| 265/55R18 | 29.5″ (1.7%) | 18 x 7.5-9.5 |
| 275/50R18 | 28.8″ (-0.7%) | 18 x 7.5-9.5 |
| 285/50R18 | 29.2″ (0.7%) | 18 x 8.0-10.0 |
| 295/45R18 | 28.5″ (-1.7%) | 18 x 9.5-11.0 |
| 305/45R18 | 28.8″ (-0.7%) | 18 x 9.5-11.5 |
| 325/45R18 | 29.5″ (1.7%) | 18 x n/a |