33.4" tall, 9.6" wide, 8.2" sidewall
A 245/85R17 tire is 33.4 inches (848 mm) tall and 9.6 inches wide. The sidewall is 85% of the width, 8.2 inches, on a 17-inch wheel, and the tire turns about 604 times per mile.
In flotation terms that is about 33.4x9.6R17, closest to the common 33x12.50R17 (33.0"). People often call it a 33-inch tire.
The size most often compared with it is 265/80R17, which is 0.3" taller (+0.9%). At an indicated 60 mph you would be doing 60.5 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 245/85R17 | |
|---|---|---|---|---|---|
| 265/80R17 | 33.7" | 10.4" | 8.3" | +0.9% | |
| 255/80R17 | 33.1" | 10.0" | 8.0" | −1.0% | |
| 235/85R17 | 32.7" | 9.3" | 7.9" | −2.0% | |
| 255/85R17 | 34.1" | 10.0" | 8.5" | +2.0% | |
| 265/75R17 | 32.6" | 10.4" | 7.8" | −2.2% | |
| 245/80R17 | 32.4" | 9.6" | 7.7" | −2.9% | |
| 255/75R17 | 32.1" | 10.0" | 7.5" | −4.0% | |
| 265/85R17 | 34.7" | 10.4" | 8.9" | +4.0% | |
| 235/80R17 | 31.8" | 9.3" | 7.4" | −4.8% | |
| 245/75R17 | 31.5" | 9.6" | 7.2" | −5.8% |
Sizes within 2% of 33.4" on 16" or 18" or 19" or 15" wheels.
| Size | Diameter | Width | Sidewall | vs 245/85R17 | |
|---|---|---|---|---|---|
| 295/75R16 | 33.4" | 11.6" | 8.7" | +0.1% | |
| 315/70R16 | 33.4" | 12.4" | 8.7" | −0.1% | |
| 325/60R18 | 33.4" | 12.8" | 7.7" | −0.1% | |
| 245/75R19 | 33.5" | 9.6" | 7.2" | +0.2% | |
| 275/80R16 | 33.3" | 10.8" | 8.7" | −0.2% | |
| 315/75R15 | 33.6" | 12.4" | 9.3" | +0.6% |
Actual speed when the speedometer is calibrated for 245/85R17.
| Speedometer shows | on 265/80R17 | on 255/80R17 | on 235/85R17 |
|---|---|---|---|
| 30 mph | 30.3 mph | 29.7 mph | 29.4 mph |
| 45 mph | 45.4 mph | 44.5 mph | 44.1 mph |
| 60 mph | 60.5 mph | 59.4 mph | 58.8 mph |
| 70 mph | 70.6 mph | 69.3 mph | 68.6 mph |
33.4 inches (848 mm). The sidewall is 8.2 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 33.4x9.6R17; the closest common flotation size is 33x12.50R17 at 33.0".
265/80R17 is +0.9% in diameter, within the common 3% guideline. It is 0.8" wider.