31.2" tall, 8.9" wide, 7.1" sidewall
A 225/80R17 tire is 31.2 inches (792 mm) tall and 8.9 inches wide. The sidewall is 80% of the width, 7.1 inches, on a 17-inch wheel, and the tire turns about 647 times per mile.
In flotation terms that is about 31.2x8.9R17. People often call it a 31-inch tire.
The size most often compared with it is 245/75R17, which is 0.3" taller (+0.9%). 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 225/80R17 | |
|---|---|---|---|---|---|
| 245/75R17 | 31.5" | 9.6" | 7.2" | +0.9% | |
| 235/80R17 | 31.8" | 9.3" | 7.4" | +2.0% | |
| 245/70R17 | 30.5" | 9.6" | 6.8" | −2.1% | |
| 225/75R17 | 30.3" | 8.9" | 6.6" | −2.8% | |
| 235/70R17 | 30.0" | 9.3" | 6.5" | −3.9% | |
| 245/80R17 | 32.4" | 9.6" | 7.7" | +4.0% | |
| 235/85R17 | 32.7" | 9.3" | 7.9" | +5.0% | |
| 225/70R17 | 29.4" | 8.9" | 6.2" | −5.7% | |
| 245/85R17 | 33.4" | 9.6" | 8.2" | +7.1% |
Sizes within 2% of 31.2" on 16" or 18" or 15" wheels.
| Size | Diameter | Width | Sidewall | vs 225/80R17 | |
|---|---|---|---|---|---|
| 275/70R16 | 31.2" | 10.8" | 7.6" | −0.1% | |
| 305/55R18 | 31.2" | 12.0" | 6.6" | +0.1% | |
| 275/75R15 | 31.2" | 10.8" | 8.1" | +0.2% | |
| 295/70R15 | 31.3" | 11.6" | 8.1" | +0.3% | |
| 225/85R16 | 31.1" | 8.9" | 7.5" | −0.4% | |
| 255/75R16 | 31.1" | 10.0" | 7.5" | −0.4% |
Actual speed when the speedometer is calibrated for 225/80R17.
| Speedometer shows | on 245/75R17 | on 235/80R17 | on 245/70R17 |
|---|---|---|---|
| 30 mph | 30.3 mph | 30.6 mph | 29.4 mph |
| 45 mph | 45.4 mph | 45.9 mph | 44.0 mph |
| 60 mph | 60.6 mph | 61.2 mph | 58.7 mph |
| 70 mph | 70.7 mph | 71.4 mph | 68.5 mph |
31.2 inches (792 mm). The sidewall is 7.1 inches.
8.9 inches (225 mm) section width, measured sidewall to sidewall.
About 31.2x8.9R17.
245/75R17 is +0.9% in diameter, within the common 3% guideline. It is 0.8" wider.