28.5" tall, 9.6" wide, 6.8" sidewall
A 245/70R15 tire is 28.5 inches (724 mm) tall and 9.6 inches wide. The sidewall is 70% of the width, 6.8 inches, on a 15-inch wheel, and the tire turns about 708 times per mile.
In flotation terms that is about 28.5x9.6R15. People often call it a 29-inch tire.
The size most often compared with it is 265/65R15, which is 0.1" taller (+0.2%). At an indicated 60 mph you would be doing 60.1 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 245/70R15 | |
|---|---|---|---|---|---|
| 265/65R15 | 28.6" | 10.4" | 6.8" | +0.2% | |
| 235/75R15 | 28.9" | 9.3" | 6.9" | +1.3% | |
| 255/65R15 | 28.1" | 10.0" | 6.5" | −1.6% | |
| 235/70R15 | 28.0" | 9.3" | 6.5" | −1.9% | |
| 255/70R15 | 29.1" | 10.0" | 7.0" | +1.9% | |
| 245/75R15 | 29.5" | 9.6" | 7.2" | +3.4% | |
| 225/70R15 | 27.4" | 8.9" | 6.2" | −3.9% | |
| 265/70R15 | 29.6" | 10.4" | 7.3" | +3.9% | |
| 255/60R15 | 27.0" | 10.0" | 6.0" | −5.1% | |
| 235/65R15 | 27.0" | 9.3" | 6.0" | −5.2% |
Sizes within 2% of 28.5" on 17" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 245/70R15 | |
|---|---|---|---|---|---|
| 325/45R17 | 28.5" | 12.8" | 5.8" | +0.0% | |
| 245/65R16 | 28.5" | 9.6" | 6.3" | +0.1% | |
| 245/60R17 | 28.6" | 9.6" | 5.8" | +0.2% | |
| 275/55R17 | 28.9" | 10.8" | 6.0" | +1.4% | |
| 205/80R16 | 28.9" | 8.1" | 6.5" | +1.4% | |
| 275/60R16 | 29.0" | 10.8" | 6.5" | +1.7% |
Actual speed when the speedometer is calibrated for 245/70R15.
| Speedometer shows | on 265/65R15 | on 235/75R15 | on 255/65R15 |
|---|---|---|---|
| 30 mph | 30.1 mph | 30.4 mph | 29.5 mph |
| 45 mph | 45.1 mph | 45.6 mph | 44.3 mph |
| 60 mph | 60.1 mph | 60.8 mph | 59.0 mph |
| 70 mph | 70.1 mph | 70.9 mph | 68.9 mph |
28.5 inches (724 mm). The sidewall is 6.8 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 28.5x9.6R15.
265/65R15 is +0.2% in diameter, within the common 3% guideline. It is 0.8" wider.