28.4" tall, 10.4" wide, 5.2" sidewall
A 265/50R18 tire is 28.4 inches (722 mm) tall and 10.4 inches wide. The sidewall is 50% of the width, 5.2 inches, on a 18-inch wheel, and the tire turns about 709 times per mile.
In flotation terms that is about 28.4x10.4R18. People often call it a 28-inch tire.
The size most often compared with it is 285/45R18, which is 0.3" shorter (−1.2%). At an indicated 60 mph you would be doing 59.3 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 18" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 265/50R18 | |
|---|---|---|---|---|---|
| 285/45R18 | 28.1" | 11.2" | 5.0" | −1.2% | |
| 255/50R18 | 28.0" | 10.0" | 5.0" | −1.4% | |
| 275/50R18 | 28.8" | 10.8" | 5.4" | +1.4% | |
| 275/45R18 | 27.7" | 10.8" | 4.9" | −2.4% | |
| 285/50R18 | 29.2" | 11.2" | 5.6" | +2.8% | |
| 265/55R18 | 29.5" | 10.4" | 5.7" | +3.7% | |
| 255/45R18 | 27.0" | 10.0" | 4.5" | −4.9% | |
| 285/40R18 | 27.0" | 11.2" | 4.5" | −5.1% | |
| 275/55R18 | 29.9" | 10.8" | 6.0" | +5.2% | |
| 275/40R18 | 26.7" | 10.8" | 4.3" | −6.2% |
Sizes within 2% of 28.4" on 17" or 16" or 20" wheels.
| Size | Diameter | Width | Sidewall | vs 265/50R18 | |
|---|---|---|---|---|---|
| 325/45R17 | 28.5" | 12.8" | 5.8" | +0.3% | |
| 245/65R16 | 28.5" | 9.6" | 6.3" | +0.4% | |
| 245/60R17 | 28.6" | 9.6" | 5.8" | +0.5% | |
| 315/35R20 | 28.7" | 12.4" | 4.3" | +0.9% | |
| 345/30R20 | 28.1" | 13.6" | 4.1" | −1.0% | |
| 295/35R20 | 28.1" | 11.6" | 4.1" | −1.1% |
Actual speed when the speedometer is calibrated for 265/50R18.
| Speedometer shows | on 285/45R18 | on 255/50R18 | on 275/50R18 |
|---|---|---|---|
| 30 mph | 29.6 mph | 29.6 mph | 30.4 mph |
| 45 mph | 44.5 mph | 44.4 mph | 45.6 mph |
| 60 mph | 59.3 mph | 59.2 mph | 60.8 mph |
| 70 mph | 69.2 mph | 69.0 mph | 71.0 mph |
28.4 inches (722 mm). The sidewall is 5.2 inches.
10.4 inches (265 mm) section width, measured sidewall to sidewall.
About 28.4x10.4R18.
285/45R18 is −1.2% in diameter, within the common 3% guideline. It is 0.8" wider.