31.6" tall, 11.2" wide, 7.3" sidewall
A 285/65R17 tire is 31.6 inches (802 mm) tall and 11.2 inches wide. The sidewall is 65% of the width, 7.3 inches, on a 17-inch wheel, and the tire turns about 639 times per mile.
In flotation terms that is about 31.6x11.2R17. People often call it a 32-inch tire.
The size most often compared with it is 265/70R17, which is 0.0" taller (+0.1%). At an indicated 60 mph you would be doing 60.0 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 285/65R17 | |
|---|---|---|---|---|---|
| 265/70R17 | 31.6" | 10.4" | 7.3" | +0.1% | compare |
| 305/60R17 | 31.4" | 12.0" | 7.2" | −0.6% | |
| 275/65R17 | 31.1" | 10.8" | 7.0" | −1.6% | |
| 295/65R17 | 32.1" | 11.6" | 7.5" | +1.6% | |
| 275/70R17 | 32.2" | 10.8" | 7.6" | +1.8% | |
| 265/65R17 | 30.6" | 10.4" | 6.8" | −3.2% | |
| 305/65R17 | 32.6" | 12.0" | 7.8" | +3.2% | |
| 265/75R17 | 32.6" | 10.4" | 7.8" | +3.4% | |
| 285/60R17 | 30.5" | 11.2" | 6.7" | −3.6% | |
| 285/70R17 | 32.7" | 11.2" | 7.9" | +3.6% | compare |
Sizes within 2% of 31.6" on 18" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 285/65R17 | |
|---|---|---|---|---|---|
| 265/65R18 | 31.6" | 10.4" | 6.8" | −0.1% | |
| 265/75R16 | 31.6" | 10.4" | 7.8" | +0.2% | |
| 245/70R18 | 31.5" | 9.6" | 6.8" | −0.3% | |
| 285/60R18 | 31.5" | 11.2" | 6.7" | −0.4% | |
| 285/70R16 | 31.7" | 11.2" | 7.9" | +0.4% | |
| 235/85R16 | 31.7" | 9.3" | 7.9" | +0.4% |
Actual speed when the speedometer is calibrated for 285/65R17.
| Speedometer shows | on 265/70R17 | on 285/70R17 | on 305/60R17 |
|---|---|---|---|
| 30 mph | 30.0 mph | 31.1 mph | 29.8 mph |
| 45 mph | 45.0 mph | 46.6 mph | 44.7 mph |
| 60 mph | 60.0 mph | 62.1 mph | 59.7 mph |
| 70 mph | 70.0 mph | 72.5 mph | 69.6 mph |
31.6 inches (802 mm). The sidewall is 7.3 inches.
11.2 inches (285 mm) section width, measured sidewall to sidewall.
About 31.6x11.2R17.
265/70R17 is +0.1% in diameter, within the common 3% guideline. It is 0.8" narrower.