33.8" tall, 12.0" wide, 8.4" sidewall
A 305/70R17 tire is 33.8 inches (859 mm) tall and 12.0 inches wide. The sidewall is 70% of the width, 8.4 inches, on a 17-inch wheel, and the tire turns about 596 times per mile.
In flotation terms that is about 33.8x12.0R17. People often call it a 34-inch tire.
The size most often compared with it is 285/75R17, 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 17" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 305/70R17 | |
|---|---|---|---|---|---|
| 285/75R17 | 33.8" | 11.2" | 8.4" | +0.1% | compare |
| 295/70R17 | 33.3" | 11.6" | 8.1" | −1.6% | |
| 315/70R17 | 34.4" | 12.4" | 8.7" | +1.6% | compare |
| 295/75R17 | 34.4" | 11.6" | 8.7" | +1.8% | |
| 315/65R17 | 33.1" | 12.4" | 8.1" | −2.0% | |
| 33x12.50R17 | 33.0" | 12.5" | 8.0" | −2.4% | |
| 285/70R17 | 32.7" | 11.2" | 7.9" | −3.3% | |
| 325/70R17 | 34.9" | 12.8" | 9.0" | +3.3% | |
| 285/80R17 | 35.0" | 11.2" | 9.0" | +3.4% | |
| 35x11.50R17 | 35.0" | 11.5" | 9.0" | +3.5% |
Sizes within 2% of 33.8" on 16" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 305/70R17 | |
|---|---|---|---|---|---|
| 265/85R16 | 33.7" | 10.4" | 8.9" | −0.2% | |
| 285/70R18 | 33.7" | 11.2" | 7.9" | −0.3% | |
| 285/80R16 | 34.0" | 11.2" | 9.0" | +0.4% | |
| 265/75R18 | 33.6" | 10.4" | 7.8" | −0.5% | |
| 305/65R18 | 33.6" | 12.0" | 7.8" | −0.6% | |
| 305/75R16 | 34.0" | 12.0" | 9.0" | +0.6% |
Actual speed when the speedometer is calibrated for 305/70R17.
| Speedometer shows | on 285/75R17 | on 315/70R17 | on 295/70R17 |
|---|---|---|---|
| 30 mph | 30.0 mph | 30.5 mph | 29.5 mph |
| 45 mph | 45.0 mph | 45.7 mph | 44.3 mph |
| 60 mph | 60.0 mph | 61.0 mph | 59.0 mph |
| 70 mph | 70.0 mph | 71.1 mph | 68.9 mph |
33.8 inches (859 mm). The sidewall is 8.4 inches.
12.0 inches (305 mm) section width, measured sidewall to sidewall.
About 33.8x12.0R17.
285/75R17 is +0.1% in diameter, within the common 3% guideline. It is 0.8" narrower.