31.4" tall, 9.6" wide, 7.7" sidewall
A 245/80R16 tire is 31.4 inches (798 mm) tall and 9.6 inches wide. The sidewall is 80% of the width, 7.7 inches, on a 16-inch wheel, and the tire turns about 642 times per mile.
In flotation terms that is about 31.4x9.6R16. People often call it a 31-inch tire.
The size most often compared with it is 265/75R16, which is 0.2" taller (+0.7%). At an indicated 60 mph you would be doing 60.4 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 245/80R16 | |
|---|---|---|---|---|---|
| 265/75R16 | 31.6" | 10.4" | 7.8" | +0.7% | |
| 235/85R16 | 31.7" | 9.3" | 7.9" | +0.9% | |
| 225/85R16 | 31.1" | 8.9" | 7.5" | −1.2% | |
| 255/75R16 | 31.1" | 10.0" | 7.5" | −1.2% | |
| 255/80R16 | 32.1" | 10.0" | 8.0" | +2.0% | |
| 265/70R16 | 30.6" | 10.4" | 7.3" | −2.6% | |
| 245/85R16 | 32.4" | 9.6" | 8.2" | +3.1% | |
| 245/75R16 | 30.5" | 9.6" | 7.2" | −3.1% | |
| 265/80R16 | 32.7" | 10.4" | 8.3" | +4.0% | |
| 255/70R16 | 30.1" | 10.0" | 7.0" | −4.4% |
Sizes within 2% of 31.4" on 17" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 245/80R16 | |
|---|---|---|---|---|---|
| 305/60R17 | 31.4" | 12.0" | 7.2" | −0.1% | |
| 285/60R18 | 31.5" | 11.2" | 6.7" | +0.1% | |
| 245/75R17 | 31.5" | 9.6" | 7.2" | +0.1% | |
| 245/70R18 | 31.5" | 9.6" | 6.8" | +0.2% | |
| 265/65R18 | 31.6" | 10.4" | 6.8" | +0.4% | |
| 285/65R17 | 31.6" | 11.2" | 7.3" | +0.5% |
Actual speed when the speedometer is calibrated for 245/80R16.
| Speedometer shows | on 265/75R16 | on 235/85R16 | on 225/85R16 |
|---|---|---|---|
| 30 mph | 30.2 mph | 30.3 mph | 29.6 mph |
| 45 mph | 45.3 mph | 45.4 mph | 44.5 mph |
| 60 mph | 60.4 mph | 60.6 mph | 59.3 mph |
| 70 mph | 70.5 mph | 70.7 mph | 69.2 mph |
31.4 inches (798 mm). The sidewall is 7.7 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 31.4x9.6R16.
265/75R16 is +0.7% in diameter, within the common 3% guideline. It is 0.8" wider.