30.1" tall, 10.0" wide, 7.0" sidewall
A 255/70R16 tire is 30.1 inches (763 mm) tall and 10.0 inches wide. The sidewall is 70% of the width, 7.0 inches, on a 16-inch wheel, and the tire turns about 671 times per mile.
In flotation terms that is about 30.1x10.0R16. People often call it a 30-inch tire.
The size most often compared with it is 245/75R16, which is 0.4" taller (+1.4%). At an indicated 60 mph you would be doing 60.8 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 255/70R16 | |
|---|---|---|---|---|---|
| 275/65R16 | 30.1" | 10.8" | 7.0" | +0.1% | |
| 235/75R16 | 29.9" | 9.3" | 6.9" | −0.6% | |
| 245/75R16 | 30.5" | 9.6" | 7.2" | +1.4% | compare |
| 265/65R16 | 29.6" | 10.4" | 6.8" | −1.6% | |
| 245/70R16 | 29.5" | 9.6" | 6.8" | −1.8% | |
| 265/70R16 | 30.6" | 10.4" | 7.3" | +1.8% | compare |
| 255/75R16 | 31.1" | 10.0" | 7.5" | +3.3% | |
| 275/60R16 | 29.0" | 10.8" | 6.5" | −3.5% | |
| 275/70R16 | 31.2" | 10.8" | 7.6" | +3.7% | |
| 245/80R16 | 31.4" | 9.6" | 7.7" | +4.6% |
Sizes within 2% of 30.1" on 17" or 15" or 14" wheels.
| Size | Diameter | Width | Sidewall | vs 255/70R16 | |
|---|---|---|---|---|---|
| 255/65R17 | 30.1" | 10.0" | 6.5" | −0.0% | |
| 255/75R15 | 30.1" | 10.0" | 7.5" | +0.0% | |
| 255/80R14 | 30.1" | 10.0" | 8.0" | +0.0% | |
| 295/65R15 | 30.1" | 11.6" | 7.5" | +0.1% | |
| 30x9.50R15 | 30.0" | 9.5" | 7.5" | −0.2% | |
| 275/60R17 | 30.0" | 10.8" | 6.5" | −0.2% |
Actual speed when the speedometer is calibrated for 255/70R16.
| Speedometer shows | on 245/75R16 | on 265/70R16 | on 275/65R16 |
|---|---|---|---|
| 30 mph | 30.4 mph | 30.6 mph | 30.0 mph |
| 45 mph | 45.6 mph | 45.8 mph | 45.0 mph |
| 60 mph | 60.8 mph | 61.1 mph | 60.0 mph |
| 70 mph | 71.0 mph | 71.3 mph | 70.0 mph |
30.1 inches (763 mm). The sidewall is 7.0 inches.
10.0 inches (255 mm) section width, measured sidewall to sidewall.
About 30.1x10.0R16.
245/75R16 is +1.4% in diameter, within the common 3% guideline. It is 0.4" narrower.