34.4" tall, 12.4" wide, 8.7" sidewall
A 315/70R17 tire is 34.4 inches (873 mm) tall and 12.4 inches wide. The sidewall is 70% of the width, 8.7 inches, on a 17-inch wheel, and the tire turns about 587 times per mile.
In flotation terms that is about 34.4x12.4R17. People often call it a 34-inch tire.
The size most often compared with it is 285/75R17, which is 0.5" shorter (−1.5%). At an indicated 60 mph you would be doing 59.1 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 315/70R17 | |
|---|---|---|---|---|---|
| 295/75R17 | 34.4" | 11.6" | 8.7" | +0.2% | |
| 305/70R17 | 33.8" | 12.0" | 8.4" | −1.6% | compare |
| 325/70R17 | 34.9" | 12.8" | 9.0" | +1.6% | |
| 35x12.50R17 | 35.0" | 12.5" | 9.0" | +1.9% | compare |
| 305/75R17 | 35.0" | 12.0" | 9.0" | +1.9% | |
| 295/70R17 | 33.3" | 11.6" | 8.1" | −3.2% | |
| 295/80R17 | 35.6" | 11.6" | 9.3" | +3.6% | |
| 315/65R17 | 33.1" | 12.4" | 8.1" | −3.6% | |
| 315/75R17 | 35.6" | 12.4" | 9.3" | +3.6% | |
| 33x12.50R17 | 33.0" | 12.5" | 8.0" | −4.0% |
Sizes within 2% of 34.4" on 16" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 315/70R17 | |
|---|---|---|---|---|---|
| 275/85R16 | 34.4" | 10.8" | 9.2" | +0.1% | |
| 295/70R18 | 34.3" | 11.6" | 8.1" | −0.3% | |
| 275/75R18 | 34.2" | 10.8" | 8.1" | −0.4% | |
| 315/65R18 | 34.1" | 12.4" | 8.1" | −0.7% | |
| 315/75R16 | 34.6" | 12.4" | 9.3" | +0.7% | |
| 325/65R18 | 34.6" | 12.8" | 8.3" | +0.8% |
Actual speed when the speedometer is calibrated for 315/70R17.
| Speedometer shows | on 285/75R17 | on 285/70R17 | on 305/70R17 |
|---|---|---|---|
| 30 mph | 29.5 mph | 28.6 mph | 29.5 mph |
| 45 mph | 44.3 mph | 42.8 mph | 44.3 mph |
| 60 mph | 59.1 mph | 57.1 mph | 59.0 mph |
| 70 mph | 68.9 mph | 66.6 mph | 68.9 mph |
34.4 inches (873 mm). The sidewall is 8.7 inches.
12.4 inches (315 mm) section width, measured sidewall to sidewall.
About 34.4x12.4R17.
285/75R17 is −1.5% in diameter, within the common 3% guideline. It is 1.2" narrower.