What does 255/40R17 mean?
255/40R17 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.
- 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.
- 17 is the diameter of the wheel in inches, on which the tire is to be mounted.
255/40R17 Tire Conversion
| Dimensions | Inches | Millimeters |
| Tire Diameter | 25 in | 635.8 mm |
| Section Width | 10 in | 255 mm |
| Rim Height | 17 in | 431 mm |
| Sidewall Height | 4 in | 102 mm |
| Circumference | 78.6 in | 1997.4 mm |
| Revolutions | 805.7 revs/mile | |
Not the tire size you are searching for? Try our Tire Size Calculator.
FAQ About 255/40R17 Tire
How tall is a 255/40R17 tire?
The height (or diameter) of a 255/40R17 tire is 25 inches
How wide is a 255/40R17 tire?
The width of a 255/40R17 tire is 255 mm, which is about 10 inches.
What size rim fits a 255/40R17 tire?
A 255/40R17 tire fits on a rim that is 17 inches in diameter.
What does the 40 in a 255/40R17 tire mean?
The 40 in a 255/40R17 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 40% of its width.
Alternative Tire Sizes for 255/40R17
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 255/40R17:
| Tire Size | Diameter | Rim |
|---|---|---|
| 145/70R17 | 25.0″ (Equal) | 17 x n/a |
| 225/45R17 | 25.0″ (Equal) | 17 x 7.0-8.5 |
| 115/95R17 | 25.6″ (2.4%) | 17 x n/a |
| 125/80R17 | 24.9″ (-0.4%) | 17 x 3.0-4.0 |
| 135/70R17 | 24.4″ (-2.4%) | 17 x n/a |
| 135/80R17 | 25.5″ (2.0%) | 17 x n/a |
| 155/70R17 | 25.5″ (2.0%) | 17 x n/a |
| 175/55R17 | 24.6″ (-1.6%) | 17 x 5.0-6.0 |
| 185/50R17 | 24.3″ (-2.8%) | 17 x 4.5-6.0 |
| 185/60R17 | 25.7″ (2.8%) | 17 x n/a |
| 195/50R17 | 24.7″ (-1.2%) | 17 x n/a |
| 195/55R17 | 25.4″ (1.6%) | 17 x 5.5-7.0 |
| 205/45R17 | 24.3″ (-2.8%) | 17 x 6.5-7.5 |
| 205/50R17 | 25.1″ (0.4%) | 17 x 5.5-7.5 |
| 215/45R17 | 24.6″ (-1.6%) | 17 x 7.0-8.0 |
| 215/50R17 | 25.5″ (2.0%) | 17 x 6.0-7.5 |
| 235/40R17 | 24.4″ (-2.4%) | 17 x 8.0-9.5 |
| 235/45R17 | 25.3″ (1.2%) | 17 x 7.5-9.0 |
| 245/40R17 | 24.7″ (-1.2%) | 17 x 8.0-9.5 |
| 245/45R17 | 25.7″ (2.8%) | 17 x 7.5-9.0 |
| 265/35R17 | 24.3″ (-2.8%) | 17 x 9.0-10.5 |
| 265/40R17 | 25.3″ (1.2%) | 17 x 9.0-10.5 |
| 275/35R17 | 24.6″ (-1.6%) | 17 x 9.0-11.0 |
| 275/40R17 | 25.7″ (2.8%) | 17 x 9.0-11.0 |
| 285/35R17 | 24.9″ (-0.4%) | 17 x n/a |
| 295/35R17 | 25.1″ (0.4%) | 17 x n/a |
| 305/35R17 | 25.4″ (1.6%) | 17 x n/a |
| 315/35R17 | 25.7″ (2.8%) | 17 x 10.5-12.5 |