28.9" tall, 8.1" wide, 6.5" sidewall
A 205/80R16 tire is 28.9 inches (734 mm) tall and 8.1 inches wide. The sidewall is 80% of the width, 6.5 inches, on a 16-inch wheel, and the tire turns about 698 times per mile.
In flotation terms that is about 28.9x8.1R16. People often call it a 29-inch tire.
The size most often compared with it is 225/75R16, which is 0.4" taller (+1.3%). 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 205/80R16 | |
|---|---|---|---|---|---|
| 225/75R16 | 29.3" | 8.9" | 6.6" | +1.3% | |
| 215/80R16 | 29.5" | 8.5" | 6.8" | +2.2% | |
| 215/85R16 | 30.4" | 8.5" | 7.2" | +5.1% | |
| 225/85R16 | 31.1" | 8.9" | 7.5" | +7.4% |
Sizes within 2% of 28.9" on 17" or 15" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 205/80R16 | |
|---|---|---|---|---|---|
| 275/55R17 | 28.9" | 10.8" | 6.0" | −0.0% | |
| 295/60R15 | 28.9" | 11.6" | 7.0" | +0.1% | |
| 235/75R15 | 28.9" | 9.3" | 6.9" | −0.1% | |
| 275/50R18 | 28.8" | 10.8" | 5.4" | −0.3% | |
| 255/70R15 | 29.1" | 10.0" | 7.0" | +0.5% | |
| 285/50R18 | 29.2" | 11.2" | 5.6" | +1.1% |
Actual speed when the speedometer is calibrated for 205/80R16.
| Speedometer shows | on 225/75R16 | on 215/80R16 | on 215/85R16 |
|---|---|---|---|
| 30 mph | 30.4 mph | 30.7 mph | 31.5 mph |
| 45 mph | 45.6 mph | 46.0 mph | 47.3 mph |
| 60 mph | 60.8 mph | 61.3 mph | 63.1 mph |
| 70 mph | 70.9 mph | 71.5 mph | 73.6 mph |
28.9 inches (734 mm). The sidewall is 6.5 inches.
8.1 inches (205 mm) section width, measured sidewall to sidewall.
About 28.9x8.1R16.
225/75R16 is +1.3% in diameter, within the common 3% guideline. It is 0.8" wider.