25.6" tall, 9.6" wide, 5.3" sidewall
A 245/55R15 tire is 25.6 inches (651 mm) tall and 9.6 inches wide. The sidewall is 55% of the width, 5.3 inches, on a 15-inch wheel, and the tire turns about 788 times per mile.
In flotation terms that is about 25.6x9.6R15. People often call it a 26-inch tire.
The size most often compared with it is 225/60R15, which is 0.0" taller (+0.1%). At an indicated 60 mph you would be doing 60.0 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 15" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 245/55R15 | |
|---|---|---|---|---|---|
| 225/60R15 | 25.6" | 8.9" | 5.3" | +0.1% | |
| 265/50R15 | 25.4" | 10.4" | 5.2" | −0.7% | |
| 255/55R15 | 26.0" | 10.0" | 5.5" | +1.7% | |
| 235/60R15 | 26.1" | 9.3" | 5.6" | +1.9% | |
| 245/60R15 | 26.6" | 9.6" | 5.8" | +3.8% | |
| 235/65R15 | 27.0" | 9.3" | 6.0" | +5.5% | |
| 255/60R15 | 27.0" | 10.0" | 6.0" | +5.6% | |
| 255/65R15 | 28.1" | 10.0" | 6.5" | +9.5% | |
| 265/65R15 | 28.6" | 10.4" | 6.8" | +11.5% |
Sizes within 2% of 25.6" on 16" or 17" or 14" wheels.
| Size | Diameter | Width | Sidewall | vs 245/55R15 | |
|---|---|---|---|---|---|
| 245/50R16 | 25.6" | 9.6" | 4.8" | +0.1% | |
| 275/40R17 | 25.7" | 10.8" | 4.3" | +0.2% | |
| 315/35R17 | 25.7" | 12.4" | 4.3" | +0.3% | |
| 195/75R14 | 25.5" | 7.7" | 5.8" | −0.4% | |
| 285/40R17 | 26.0" | 11.2" | 4.5" | +1.4% | |
| 255/45R17 | 26.0" | 10.0" | 4.5" | +1.7% |
Actual speed when the speedometer is calibrated for 245/55R15.
| Speedometer shows | on 225/60R15 | on 265/50R15 | on 255/55R15 |
|---|---|---|---|
| 30 mph | 30.0 mph | 29.8 mph | 30.5 mph |
| 45 mph | 45.0 mph | 44.7 mph | 45.8 mph |
| 60 mph | 60.0 mph | 59.6 mph | 61.0 mph |
| 70 mph | 70.1 mph | 69.5 mph | 71.2 mph |
25.6 inches (651 mm). The sidewall is 5.3 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 25.6x9.6R15.
225/60R15 is +0.1% in diameter, within the common 3% guideline. It is 0.8" narrower.