29.5" tall, 9.6" wide, 7.2" sidewall
A 245/75R15 tire is 29.5 inches (749 mm) tall and 9.6 inches wide. The sidewall is 75% of the width, 7.2 inches, on a 15-inch wheel, and the tire turns about 684 times per mile.
In flotation terms that is about 29.5x9.6R15, closest to the common 30x9.50R15 (30.0"). People often call it a 29-inch tire.
The size most often compared with it is 265/70R15, which is 0.1" taller (+0.5%). At an indicated 60 mph you would be doing 60.3 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 245/75R15 | |
|---|---|---|---|---|---|
| 265/70R15 | 29.6" | 10.4" | 7.3" | +0.5% | |
| 255/70R15 | 29.1" | 10.0" | 7.0" | −1.4% | |
| 30x9.50R15 | 30.0" | 9.5" | 7.5" | +1.8% | |
| 235/75R15 | 28.9" | 9.3" | 6.9" | −2.0% | |
| 255/75R15 | 30.1" | 10.0" | 7.5" | +2.0% | |
| 265/65R15 | 28.6" | 10.4" | 6.8" | −3.1% | |
| 245/70R15 | 28.5" | 9.6" | 6.8" | −3.3% | |
| 265/75R15 | 30.6" | 10.4" | 7.8" | +4.0% | |
| 235/85R15 | 30.7" | 9.3" | 7.9" | +4.3% | |
| 255/65R15 | 28.1" | 10.0" | 6.5" | −4.8% |
Sizes within 2% of 29.5" on 16" or 17" wheels.
| Size | Diameter | Width | Sidewall | vs 245/75R15 | |
|---|---|---|---|---|---|
| 285/60R16 | 29.5" | 11.2" | 6.7" | −0.0% | |
| 245/70R16 | 29.5" | 9.6" | 6.8" | +0.1% | |
| 265/60R17 | 29.5" | 10.4" | 6.3" | +0.2% | |
| 225/70R17 | 29.4" | 8.9" | 6.2" | −0.2% | |
| 315/50R17 | 29.4" | 12.4" | 6.2" | −0.2% | |
| 215/80R16 | 29.5" | 8.5" | 6.8" | +0.3% |
Actual speed when the speedometer is calibrated for 245/75R15.
| Speedometer shows | on 265/70R15 | on 255/70R15 | on 30x9.50R15 |
|---|---|---|---|
| 30 mph | 30.1 mph | 29.6 mph | 30.5 mph |
| 45 mph | 45.2 mph | 44.4 mph | 45.8 mph |
| 60 mph | 60.3 mph | 59.2 mph | 61.1 mph |
| 70 mph | 70.3 mph | 69.0 mph | 71.3 mph |
29.5 inches (749 mm). The sidewall is 7.2 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 29.5x9.6R15; the closest common flotation size is 30x9.50R15 at 30.0".
265/70R15 is +0.5% in diameter, within the common 3% guideline. It is 0.8" wider.