34.0" tall, 12.0" wide, 9.0" sidewall
A 305/75R16 tire is 34.0 inches (864 mm) tall and 12.0 inches wide. The sidewall is 75% of the width, 9.0 inches, on a 16-inch wheel, and the tire turns about 593 times per mile.
In flotation terms that is about 34.0x12.0R16. People often call it a 34-inch tire.
The size most often compared with it is 285/75R16, which is 1.2" shorter (−3.5%). At an indicated 60 mph you would be doing 57.9 mph on it, more than the 3% change many shops use as a limit.
| 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 305/75R16 | |
|---|---|---|---|---|---|
| 285/80R16 | 34.0" | 11.2" | 9.0" | −0.2% | |
| 315/75R16 | 34.6" | 12.4" | 9.3" | +1.7% | compare |
| 295/75R16 | 33.4" | 11.6" | 8.7" | −1.7% | |
| 315/70R16 | 33.4" | 12.4" | 8.7" | −1.9% | |
| 33x12.50R16 | 33.0" | 12.5" | 8.5" | −3.0% | |
| 285/85R16 | 35.1" | 11.2" | 9.5" | +3.1% | |
| 285/75R16 | 32.8" | 11.2" | 8.4" | −3.5% | compare |
| 325/75R16 | 35.2" | 12.8" | 9.6" | +3.5% | |
| 305/70R16 | 32.8" | 12.0" | 8.4" | −3.5% | |
| 295/70R16 | 32.3" | 11.6" | 8.1" | −5.2% |
Sizes within 2% of 34.0" on 18" or 17" wheels.
| Size | Diameter | Width | Sidewall | vs 305/75R16 | |
|---|---|---|---|---|---|
| 255/80R18 | 34.1" | 10.0" | 8.0" | +0.2% | |
| 255/85R17 | 34.1" | 10.0" | 8.5" | +0.2% | |
| 315/65R18 | 34.1" | 12.4" | 8.1" | +0.3% | |
| 285/75R17 | 33.8" | 11.2" | 8.4" | −0.5% | |
| 305/70R17 | 33.8" | 12.0" | 8.4" | −0.6% | |
| 275/75R18 | 34.2" | 10.8" | 8.1" | +0.7% |
Actual speed when the speedometer is calibrated for 305/75R16.
| Speedometer shows | on 285/75R16 | on 315/75R16 | on 285/80R16 |
|---|---|---|---|
| 30 mph | 29.0 mph | 30.5 mph | 29.9 mph |
| 45 mph | 43.4 mph | 45.8 mph | 44.9 mph |
| 60 mph | 57.9 mph | 61.0 mph | 59.9 mph |
| 70 mph | 67.6 mph | 71.2 mph | 69.9 mph |
34.0 inches (864 mm). The sidewall is 9.0 inches.
12.0 inches (305 mm) section width, measured sidewall to sidewall.
About 34.0x12.0R16.
285/75R16 is −3.5% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.8" narrower.