30.3" tall, 8.9" wide, 6.6" sidewall
A 225/75R17 tire is 30.3 inches (769 mm) tall and 8.9 inches wide. The sidewall is 75% of the width, 6.6 inches, on a 17-inch wheel, and the tire turns about 666 times per mile.
In flotation terms that is about 30.3x8.9R17. People often call it a 30-inch tire.
The size most often compared with it is 245/70R17, which is 0.2" taller (+0.7%). At an indicated 60 mph you would be doing 60.4 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 225/75R17 | |
|---|---|---|---|---|---|
| 245/70R17 | 30.5" | 9.6" | 6.8" | +0.7% | |
| 235/70R17 | 30.0" | 9.3" | 6.5" | −1.1% | |
| 225/80R17 | 31.2" | 8.9" | 7.1" | +2.9% | |
| 225/70R17 | 29.4" | 8.9" | 6.2" | −2.9% | |
| 245/75R17 | 31.5" | 9.6" | 7.2" | +3.9% | |
| 235/80R17 | 31.8" | 9.3" | 7.4" | +5.0% | |
| 245/80R17 | 32.4" | 9.6" | 7.7" | +7.1% | |
| 235/85R17 | 32.7" | 9.3" | 7.9" | +8.1% | |
| 205/65R17 | 27.5" | 8.1" | 5.2" | −9.2% | |
| 245/85R17 | 33.4" | 9.6" | 8.2" | +10.3% |
Sizes within 2% of 30.3" on 18" or 15" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 225/75R17 | |
|---|---|---|---|---|---|
| 285/55R18 | 30.3" | 11.2" | 6.2" | +0.2% | |
| 325/60R15 | 30.4" | 12.8" | 7.7" | +0.2% | |
| 215/85R16 | 30.4" | 8.5" | 7.2" | +0.3% | |
| 275/70R15 | 30.2" | 10.8" | 7.6" | −0.4% | |
| 245/75R16 | 30.5" | 9.6" | 7.2" | +0.6% | |
| 295/65R15 | 30.1" | 11.6" | 7.5" | −0.6% |
Actual speed when the speedometer is calibrated for 225/75R17.
| Speedometer shows | on 245/70R17 | on 235/70R17 | on 225/80R17 |
|---|---|---|---|
| 30 mph | 30.2 mph | 29.7 mph | 30.9 mph |
| 45 mph | 45.3 mph | 44.5 mph | 46.3 mph |
| 60 mph | 60.4 mph | 59.3 mph | 61.8 mph |
| 70 mph | 70.5 mph | 69.2 mph | 72.0 mph |
30.3 inches (769 mm). The sidewall is 6.6 inches.
8.9 inches (225 mm) section width, measured sidewall to sidewall.
About 30.3x8.9R17.
245/70R17 is +0.7% in diameter, within the common 3% guideline. It is 0.8" wider.