30.0" tall, 9.3" wide, 6.5" sidewall
A 235/70R17 tire is 30.0 inches (761 mm) tall and 9.3 inches wide. The sidewall is 70% of the width, 6.5 inches, on a 17-inch wheel, and the tire turns about 673 times per mile.
In flotation terms that is about 30.0x9.3R17. People often call it a 30-inch tire.
The size most often compared with it is 255/65R17, which is 0.1" taller (+0.3%). At an indicated 60 mph you would be doing 60.2 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 235/70R17 | |
|---|---|---|---|---|---|
| 255/65R17 | 30.1" | 10.0" | 6.5" | +0.3% | |
| 225/75R17 | 30.3" | 8.9" | 6.6" | +1.1% | |
| 225/70R17 | 29.4" | 8.9" | 6.2" | −1.8% | |
| 245/70R17 | 30.5" | 9.6" | 6.8" | +1.8% | |
| 255/70R17 | 31.1" | 10.0" | 7.0" | +3.7% | |
| 225/80R17 | 31.2" | 8.9" | 7.1" | +4.1% | |
| 245/60R17 | 28.6" | 9.6" | 5.8" | −4.6% | |
| 245/75R17 | 31.5" | 9.6" | 7.2" | +5.1% | |
| 235/80R17 | 31.8" | 9.3" | 7.4" | +6.2% | |
| 255/75R17 | 32.1" | 10.0" | 7.5" | +7.0% |
Sizes within 2% of 30.0" on 18" or 15" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 235/70R17 | |
|---|---|---|---|---|---|
| 275/55R18 | 29.9" | 10.8" | 6.0" | −0.1% | |
| 30x9.50R15 | 30.0" | 9.5" | 7.5" | +0.2% | |
| 315/60R15 | 29.9" | 12.4" | 7.4" | −0.2% | |
| 235/75R16 | 29.9" | 9.3" | 6.9" | −0.2% | |
| 255/70R16 | 30.1" | 10.0" | 7.0" | +0.3% | |
| 255/75R15 | 30.1" | 10.0" | 7.5" | +0.4% |
Actual speed when the speedometer is calibrated for 235/70R17.
| Speedometer shows | on 255/65R17 | on 225/75R17 | on 225/70R17 |
|---|---|---|---|
| 30 mph | 30.1 mph | 30.3 mph | 29.4 mph |
| 45 mph | 45.1 mph | 45.5 mph | 44.2 mph |
| 60 mph | 60.2 mph | 60.7 mph | 58.9 mph |
| 70 mph | 70.2 mph | 70.8 mph | 68.7 mph |
30.0 inches (761 mm). The sidewall is 6.5 inches.
9.3 inches (235 mm) section width, measured sidewall to sidewall.
About 30.0x9.3R17.
255/65R17 is +0.3% in diameter, within the common 3% guideline. It is 0.8" wider.