27.6" tall, 9.6" wide, 5.3" sidewall
A 245/55R17 tire is 27.6 inches (701 mm) tall and 9.6 inches wide. The sidewall is 55% of the width, 5.3 inches, on a 17-inch wheel, and the tire turns about 730 times per mile.
In flotation terms that is about 27.6x9.6R17. People often call it a 28-inch tire.
The size most often compared with it is 265/50R17, which is 0.2" shorter (−0.6%). At an indicated 60 mph you would be doing 59.6 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 17" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 245/55R17 | |
|---|---|---|---|---|---|
| 265/50R17 | 27.4" | 10.4" | 5.2" | −0.6% | |
| 245/60R17 | 28.6" | 9.6" | 5.8" | +3.5% | |
| 255/45R17 | 26.0" | 10.0" | 4.5" | −5.7% | |
| 265/60R17 | 29.5" | 10.4" | 6.3" | +6.9% | |
| 255/65R17 | 30.1" | 10.0" | 6.5" | +8.8% | |
| 265/65R17 | 30.6" | 10.4" | 6.8" | +10.7% |
Sizes within 2% of 27.6" on 15" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 245/55R17 | |
|---|---|---|---|---|---|
| 215/75R15 | 27.7" | 8.5" | 6.3" | +0.3% | |
| 275/45R18 | 27.7" | 10.8" | 4.9" | +0.5% | |
| 295/55R15 | 27.8" | 11.6" | 6.4" | +0.6% | |
| 325/50R15 | 27.8" | 12.8" | 6.4" | +0.7% | |
| 225/70R15 | 27.4" | 8.9" | 6.2" | −0.8% | |
| 315/50R15 | 27.4" | 12.4" | 6.2" | −0.8% |
Actual speed when the speedometer is calibrated for 245/55R17.
| Speedometer shows | on 265/50R17 | on 245/60R17 | on 255/45R17 |
|---|---|---|---|
| 30 mph | 29.8 mph | 31.0 mph | 28.3 mph |
| 45 mph | 44.7 mph | 46.6 mph | 42.4 mph |
| 60 mph | 59.6 mph | 62.1 mph | 56.6 mph |
| 70 mph | 69.6 mph | 72.4 mph | 66.0 mph |
27.6 inches (701 mm). The sidewall is 5.3 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 27.6x9.6R17.
265/50R17 is −0.6% in diameter, within the common 3% guideline. It is 0.8" wider.