36.4" tall, 12.4" wide, 6.2" sidewall
A 315/50R24 tire is 36.4 inches (925 mm) tall and 12.4 inches wide. The sidewall is 50% of the width, 6.2 inches, on a 24-inch wheel, and the tire turns about 554 times per mile.
In flotation terms that is about 36.4x12.4R24, closest to the common 37x13.50R24 (37.0"). People often call it a 36-inch tire.
The size most often compared with it is 325/45R24, which is 0.9" shorter (−2.4%). At an indicated 60 mph you would be doing 58.5 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 24" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 315/50R24 | |
|---|---|---|---|---|---|
| 325/45R24 | 35.5" | 12.8" | 5.8" | −2.4% | |
| 315/45R24 | 35.2" | 12.4" | 5.6" | −3.4% | |
| 35x12.50R24 | 35.0" | 12.5" | 5.5" | −3.9% | |
| 305/45R24 | 34.8" | 12.0" | 5.4" | −4.4% | |
| 295/45R24 | 34.5" | 11.6" | 5.2" | −5.4% | |
| 305/40R24 | 33.6" | 12.0" | 4.8" | −7.7% | |
| 295/40R24 | 33.3" | 11.6" | 4.6" | −8.5% |
Sizes within 2% of 36.4" on 22" wheels.
| Size | Diameter | Width | Sidewall | vs 315/50R24 | |
|---|---|---|---|---|---|
| 275/65R22 | 36.1" | 10.8" | 7.0" | −0.9% | |
| 325/55R22 | 36.1" | 12.8" | 7.0" | −0.9% | |
| 255/70R22 | 36.1" | 10.0" | 7.0" | −1.0% | |
| 295/60R22 | 35.9" | 11.6" | 7.0" | −1.3% | |
| 37x12.50R22 | 37.0" | 12.5" | 7.5" | +1.6% | |
| 37x13.50R22 | 37.0" | 13.5" | 7.5" | +1.6% |
Actual speed when the speedometer is calibrated for 315/50R24.
| Speedometer shows | on 325/45R24 | on 315/45R24 | on 35x12.50R24 |
|---|---|---|---|
| 30 mph | 29.3 mph | 29.0 mph | 28.8 mph |
| 45 mph | 43.9 mph | 43.5 mph | 43.3 mph |
| 60 mph | 58.5 mph | 58.0 mph | 57.7 mph |
| 70 mph | 68.3 mph | 67.6 mph | 67.3 mph |
36.4 inches (925 mm). The sidewall is 6.2 inches.
12.4 inches (315 mm) section width, measured sidewall to sidewall.
About 36.4x12.4R24; the closest common flotation size is 37x13.50R24 at 37.0".
325/45R24 is −2.4% in diameter, within the common 3% guideline. It is 0.4" wider.