31.9" tall, 12.4" wide, 7.4" sidewall
A 315/60R17 tire is 31.9 inches (810 mm) tall and 12.4 inches wide. The sidewall is 60% of the width, 7.4 inches, on a 17-inch wheel, and the tire turns about 633 times per mile.
In flotation terms that is about 31.9x12.4R17. People often call it a 32-inch tire.
The size most often compared with it is 295/65R17, which is 0.2" taller (+0.7%). At an indicated 60 mph you would be doing 60.4 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 315/60R17 | |
|---|---|---|---|---|---|
| 295/65R17 | 32.1" | 11.6" | 7.5" | +0.7% | |
| 305/60R17 | 31.4" | 12.0" | 7.2" | −1.5% | |
| 305/65R17 | 32.6" | 12.0" | 7.8" | +2.3% | |
| 33x12.50R17 | 33.0" | 12.5" | 8.0" | +3.5% | |
| 315/55R17 | 30.6" | 12.4" | 6.8" | −3.9% | |
| 315/65R17 | 33.1" | 12.4" | 8.1" | +3.9% | |
| 295/70R17 | 33.3" | 11.6" | 8.1" | +4.3% | |
| 305/55R17 | 30.2" | 12.0" | 6.6" | −5.2% | |
| 305/70R17 | 33.8" | 12.0" | 8.4" | +6.1% | |
| 315/50R17 | 29.4" | 12.4" | 6.2" | −7.8% |
Sizes within 2% of 31.9" on 18" or 15" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 315/60R17 | |
|---|---|---|---|---|---|
| 235/75R18 | 31.9" | 9.3" | 6.9" | −0.0% | |
| 285/75R15 | 31.8" | 11.2" | 8.4" | −0.2% | |
| 295/60R18 | 31.9" | 11.6" | 7.0" | +0.2% | |
| 305/70R15 | 31.8" | 12.0" | 8.4" | −0.2% | |
| 32x11.50R15 | 32.0" | 11.5" | 8.5" | +0.4% | |
| 235/85R16 | 31.7" | 9.3" | 7.9" | −0.5% |
Actual speed when the speedometer is calibrated for 315/60R17.
| Speedometer shows | on 295/65R17 | on 305/60R17 | on 305/65R17 |
|---|---|---|---|
| 30 mph | 30.2 mph | 29.6 mph | 30.7 mph |
| 45 mph | 45.3 mph | 44.3 mph | 46.0 mph |
| 60 mph | 60.4 mph | 59.1 mph | 61.4 mph |
| 70 mph | 70.5 mph | 69.0 mph | 71.6 mph |
31.9 inches (810 mm). The sidewall is 7.4 inches.
12.4 inches (315 mm) section width, measured sidewall to sidewall.
About 31.9x12.4R17.
295/65R17 is +0.7% in diameter, within the common 3% guideline. It is 0.8" narrower.