32.7" tall, 11.2" wide, 7.9" sidewall
A 285/70R17 tire is 32.7 inches (831 mm) tall and 11.2 inches wide. The sidewall is 70% of the width, 7.9 inches, on a 17-inch wheel, and the tire turns about 617 times per mile.
In flotation terms that is about 32.7x11.2R17, closest to the common 33x12.50R17 (33.0"). People often call it a 33-inch tire.
The size most often compared with it is 265/70R17, which is 1.1" shorter (−3.4%). At an indicated 60 mph you would be doing 58.0 mph on it, more than the 3% change many shops use as a limit.
| Current | New | Difference |
|---|
| Shows | Actual speed |
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Same 17" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 285/70R17 | |
|---|---|---|---|---|---|
| 265/75R17 | 32.6" | 10.4" | 7.8" | −0.2% | |
| 305/65R17 | 32.6" | 12.0" | 7.8" | −0.3% | compare |
| 275/70R17 | 32.2" | 10.8" | 7.6" | −1.7% | compare |
| 295/70R17 | 33.3" | 11.6" | 8.1" | +1.7% | compare |
| 295/65R17 | 32.1" | 11.6" | 7.5" | −1.9% | |
| 265/80R17 | 33.7" | 10.4" | 8.3" | +3.0% | |
| 265/70R17 | 31.6" | 10.4" | 7.3" | −3.4% | compare |
| 305/70R17 | 33.8" | 12.0" | 8.4" | +3.4% | |
| 285/65R17 | 31.6" | 11.2" | 7.3" | −3.4% | compare |
| 285/75R17 | 33.8" | 11.2" | 8.4" | +3.4% | compare |
Sizes within 2% of 32.7" on 16" or 15" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 285/70R17 | |
|---|---|---|---|---|---|
| 265/80R16 | 32.7" | 10.4" | 8.3" | −0.0% | |
| 265/85R15 | 32.7" | 10.4" | 8.9" | +0.1% | |
| 235/80R18 | 32.8" | 9.3" | 7.4" | +0.3% | |
| 265/70R18 | 32.6" | 10.4" | 7.3" | −0.3% | |
| 305/70R16 | 32.8" | 12.0" | 8.4" | +0.3% | |
| 285/65R18 | 32.6" | 11.2" | 7.3" | −0.4% |
Actual speed when the speedometer is calibrated for 285/70R17.
| Speedometer shows | on 265/70R17 | on 295/70R17 | on 255/80R17 |
|---|---|---|---|
| 30 mph | 29.0 mph | 30.5 mph | 30.3 mph |
| 45 mph | 43.5 mph | 45.8 mph | 45.5 mph |
| 60 mph | 58.0 mph | 61.0 mph | 60.6 mph |
| 70 mph | 67.6 mph | 71.2 mph | 70.8 mph |
32.7 inches (831 mm). The sidewall is 7.9 inches.
11.2 inches (285 mm) section width, measured sidewall to sidewall.
About 32.7x11.2R17; the closest common flotation size is 33x12.50R17 at 33.0".
265/70R17 is −3.4% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.8" narrower.