31.5" tall, 9.6" wide, 7.2" sidewall
A 245/75R17 tire is 31.5 inches (799 mm) tall and 9.6 inches wide. The sidewall is 75% of the width, 7.2 inches, on a 17-inch wheel, and the tire turns about 641 times per mile.
In flotation terms that is about 31.5x9.6R17. People often call it a 31-inch tire.
The size most often compared with it is 235/80R17, which is 0.3" taller (+1.1%). At an indicated 60 mph you would be doing 60.6 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 245/75R17 | |
|---|---|---|---|---|---|
| 265/70R17 | 31.6" | 10.4" | 7.3" | +0.4% | compare |
| 225/80R17 | 31.2" | 8.9" | 7.1" | −0.9% | |
| 235/80R17 | 31.8" | 9.3" | 7.4" | +1.1% | compare |
| 255/70R17 | 31.1" | 10.0" | 7.0" | −1.3% | |
| 255/75R17 | 32.1" | 10.0" | 7.5" | +1.9% | |
| 265/65R17 | 30.6" | 10.4" | 6.8" | −2.9% | |
| 245/80R17 | 32.4" | 9.6" | 7.7" | +3.1% | |
| 245/70R17 | 30.5" | 9.6" | 6.8" | −3.1% | |
| 225/75R17 | 30.3" | 8.9" | 6.6" | −3.8% | |
| 265/75R17 | 32.6" | 10.4" | 7.8" | +3.8% |
Sizes within 2% of 31.5" on 18" or 16" or 19" wheels.
| Size | Diameter | Width | Sidewall | vs 245/75R17 | |
|---|---|---|---|---|---|
| 285/60R18 | 31.5" | 11.2" | 6.7" | −0.0% | |
| 245/80R16 | 31.4" | 9.6" | 7.7" | −0.1% | |
| 245/70R18 | 31.5" | 9.6" | 6.8" | +0.1% | |
| 225/70R19 | 31.4" | 8.9" | 6.2" | −0.2% | |
| 265/65R18 | 31.6" | 10.4" | 6.8" | +0.3% | |
| 265/75R16 | 31.6" | 10.4" | 7.8" | +0.6% |
Actual speed when the speedometer is calibrated for 245/75R17.
| Speedometer shows | on 235/80R17 | on 265/70R17 | on 255/80R17 |
|---|---|---|---|
| 30 mph | 30.3 mph | 30.1 mph | 31.5 mph |
| 45 mph | 45.5 mph | 45.2 mph | 47.3 mph |
| 60 mph | 60.6 mph | 60.3 mph | 63.0 mph |
| 70 mph | 70.7 mph | 70.3 mph | 73.5 mph |
31.5 inches (799 mm). The sidewall is 7.2 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 31.5x9.6R17.
235/80R17 is +1.1% in diameter, within the common 3% guideline. It is 0.4" narrower.