32.1" tall, 10.0" wide, 8.0" sidewall
A 255/80R16 tire is 32.1 inches (814 mm) tall and 10.0 inches wide. The sidewall is 80% of the width, 8.0 inches, on a 16-inch wheel, and the tire turns about 629 times per mile.
In flotation terms that is about 32.1x10.0R16. People often call it a 32-inch tire.
The size most often compared with it is 275/75R16, which is 0.2" taller (+0.6%). At an indicated 60 mph you would be doing 60.3 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 16" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 255/80R16 | |
|---|---|---|---|---|---|
| 275/75R16 | 32.2" | 10.8" | 8.1" | +0.6% | |
| 235/85R16 | 31.7" | 9.3" | 7.9" | −1.0% | |
| 245/85R16 | 32.4" | 9.6" | 8.2" | +1.0% | |
| 265/75R16 | 31.6" | 10.4" | 7.8" | −1.3% | |
| 245/80R16 | 31.4" | 9.6" | 7.7" | −2.0% | |
| 265/80R16 | 32.7" | 10.4" | 8.3" | +2.0% | |
| 275/70R16 | 31.2" | 10.8" | 7.6" | −2.8% | |
| 255/75R16 | 31.1" | 10.0" | 7.5" | −3.1% | |
| 255/85R16 | 33.1" | 10.0" | 8.5" | +3.1% | |
| 275/80R16 | 33.3" | 10.8" | 8.7" | +3.9% |
Sizes within 2% of 32.1" on 17" or 15" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 255/80R16 | |
|---|---|---|---|---|---|
| 255/75R17 | 32.1" | 10.0" | 7.5" | −0.0% | |
| 255/85R15 | 32.1" | 10.0" | 8.5" | +0.0% | |
| 255/70R18 | 32.1" | 10.0" | 7.0" | −0.0% | |
| 275/65R18 | 32.1" | 10.8" | 7.0" | +0.0% | |
| 295/65R17 | 32.1" | 11.6" | 7.5" | +0.1% | |
| 32x11.50R15 | 32.0" | 11.5" | 8.5" | −0.2% |
Actual speed when the speedometer is calibrated for 255/80R16.
| Speedometer shows | on 275/75R16 | on 235/85R16 | on 245/85R16 |
|---|---|---|---|
| 30 mph | 30.2 mph | 29.7 mph | 30.3 mph |
| 45 mph | 45.2 mph | 44.5 mph | 45.5 mph |
| 60 mph | 60.3 mph | 59.4 mph | 60.6 mph |
| 70 mph | 70.4 mph | 69.3 mph | 70.7 mph |
32.1 inches (814 mm). The sidewall is 8.0 inches.
10.0 inches (255 mm) section width, measured sidewall to sidewall.
About 32.1x10.0R16.
275/75R16 is +0.6% in diameter, within the common 3% guideline. It is 0.8" wider.