33.1" tall, 10.0" wide, 8.0" sidewall
A 255/80R17 tire is 33.1 inches (840 mm) tall and 10.0 inches wide. The sidewall is 80% of the width, 8.0 inches, on a 17-inch wheel, and the tire turns about 610 times per mile.
In flotation terms that is about 33.1x10.0R17, closest to the common 33x12.50R17 (33.0"). People often call it a 33-inch tire.
The size most often compared with it is 235/80R17, which is 1.3" shorter (−3.8%). At an indicated 60 mph you would be doing 57.7 mph on it, more than the 3% change many shops use as a limit.
| 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 255/80R17 | |
|---|---|---|---|---|---|
| 245/85R17 | 33.4" | 9.6" | 8.2" | +1.0% | |
| 235/85R17 | 32.7" | 9.3" | 7.9" | −1.0% | |
| 265/75R17 | 32.6" | 10.4" | 7.8" | −1.3% | |
| 245/80R17 | 32.4" | 9.6" | 7.7" | −1.9% | |
| 265/80R17 | 33.7" | 10.4" | 8.3" | +1.9% | |
| 275/70R17 | 32.2" | 10.8" | 7.6" | −2.7% | compare |
| 255/75R17 | 32.1" | 10.0" | 7.5" | −3.0% | |
| 255/85R17 | 34.1" | 10.0" | 8.5" | +3.0% | |
| 235/80R17 | 31.8" | 9.3" | 7.4" | −3.8% | compare |
| 275/80R17 | 34.3" | 10.8" | 8.7" | +3.8% |
Sizes within 2% of 33.1" on 18" or 16" or 19" or 15" wheels.
| Size | Diameter | Width | Sidewall | vs 255/80R17 | |
|---|---|---|---|---|---|
| 255/75R18 | 33.1" | 10.0" | 7.5" | −0.0% | |
| 255/85R16 | 33.1" | 10.0" | 8.5" | +0.0% | |
| 255/70R19 | 33.1" | 10.0" | 7.0" | −0.0% | |
| 295/65R18 | 33.1" | 11.6" | 7.5" | +0.1% | |
| 33x10.50R15 | 33.0" | 10.5" | 9.0" | −0.2% | |
| 33x12.50R15 | 33.0" | 12.5" | 9.0" | −0.2% |
Actual speed when the speedometer is calibrated for 255/80R17.
| Speedometer shows | on 235/80R17 | on 285/70R17 | on 265/70R17 |
|---|---|---|---|
| 30 mph | 28.9 mph | 29.7 mph | 28.7 mph |
| 45 mph | 43.3 mph | 44.5 mph | 43.0 mph |
| 60 mph | 57.7 mph | 59.4 mph | 57.4 mph |
| 70 mph | 67.3 mph | 69.2 mph | 66.9 mph |
33.1 inches (840 mm). The sidewall is 8.0 inches.
10.0 inches (255 mm) section width, measured sidewall to sidewall.
About 33.1x10.0R17; the closest common flotation size is 33x12.50R17 at 33.0".
235/80R17 is −3.8% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.8" narrower.