32.8" tall, 12.0" wide, 8.4" sidewall
A 305/70R16 tire is 32.8 inches (833 mm) tall and 12.0 inches wide. The sidewall is 70% of the width, 8.4 inches, on a 16-inch wheel, and the tire turns about 615 times per mile.
In flotation terms that is about 32.8x12.0R16, closest to the common 33x12.50R16 (33.0"). People often call it a 33-inch tire.
The size most often compared with it is 285/75R16, which is 0.0" taller (+0.1%). At an indicated 60 mph you would be doing 60.0 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 305/70R16 | |
|---|---|---|---|---|---|
| 285/75R16 | 32.8" | 11.2" | 8.4" | +0.1% | compare |
| 33x12.50R16 | 33.0" | 12.5" | 8.5" | +0.6% | |
| 315/70R16 | 33.4" | 12.4" | 8.7" | +1.7% | |
| 295/70R16 | 32.3" | 11.6" | 8.1" | −1.7% | |
| 295/75R16 | 33.4" | 11.6" | 8.7" | +1.9% | compare |
| 285/70R16 | 31.7" | 11.2" | 7.9" | −3.4% | |
| 285/80R16 | 34.0" | 11.2" | 9.0" | +3.5% | |
| 305/75R16 | 34.0" | 12.0" | 9.0" | +3.7% | |
| 315/75R16 | 34.6" | 12.4" | 9.3" | +5.5% | compare |
| 285/65R16 | 30.6" | 11.2" | 7.3" | −6.8% |
Sizes within 2% of 32.8" on 18" or 15" or 17" wheels.
| Size | Diameter | Width | Sidewall | vs 305/70R16 | |
|---|---|---|---|---|---|
| 235/80R18 | 32.8" | 9.3" | 7.4" | −0.0% | |
| 265/85R15 | 32.7" | 10.4" | 8.9" | −0.2% | |
| 235/85R17 | 32.7" | 9.3" | 7.9" | −0.3% | |
| 285/70R17 | 32.7" | 11.2" | 7.9" | −0.3% | |
| 265/75R17 | 32.6" | 10.4" | 7.8" | −0.5% | |
| 33x10.50R15 | 33.0" | 10.5" | 9.0" | +0.6% |
Actual speed when the speedometer is calibrated for 305/70R16.
| Speedometer shows | on 285/75R16 | on 295/75R16 | on 315/75R16 |
|---|---|---|---|
| 30 mph | 30.0 mph | 30.6 mph | 31.6 mph |
| 45 mph | 45.0 mph | 45.8 mph | 47.5 mph |
| 60 mph | 60.0 mph | 61.1 mph | 63.3 mph |
| 70 mph | 70.0 mph | 71.3 mph | 73.8 mph |
32.8 inches (833 mm). The sidewall is 8.4 inches.
12.0 inches (305 mm) section width, measured sidewall to sidewall.
About 32.8x12.0R16; the closest common flotation size is 33x12.50R16 at 33.0".
285/75R16 is +0.1% in diameter, within the common 3% guideline. It is 0.8" narrower.