Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 29.92 (760) | 3.72 (94.5) 14.2% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 94 (2387.61) | 11.69 (296.88) 14.2% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 4.96 (126) | 1.86 (47.25) 60% |
| Revolutions per mile (km) | 769.75 (478.3) | 674.04 (418.83) | -95.71 (-59.47) -12.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.84 mph (36.76 km/h) |
| 25 mph (40.23 km/h) | 28.55 mph (45.95 km/h) |
| 30 mph (48.28 km/h) | 34.26 mph (55.14 km/h) |
| 35 mph (56.33 km/h) | 39.97 mph (64.33 km/h) |
| 40 mph (64.37 km/h) | 45.68 mph (73.51 km/h) |
| 45 mph (72.42 km/h) | 51.39 mph (82.7 km/h) |
| 50 mph (80.47 km/h) | 57.1 mph (91.89 km/h) |
| 55 mph (88.51 km/h) | 62.81 mph (101.08 km/h) |
| 60 mph (96.56 km/h) | 68.52 mph (110.27 km/h) |
| 65 mph (104.61 km/h) | 74.23 mph (119.46 km/h) |
| 70 mph (112.65 km/h) | 79.94 mph (128.65 km/h) |
| 75 mph (120.7 km/h) | 85.65 mph (137.84 km/h) |
| 80 mph (128.75 km/h) | 91.36 mph (147.03 km/h) |
| 85 mph (136.79 km/h) | 97.07 mph (156.22 km/h) |
| 90 mph (144.84 km/h) | 102.78 mph (165.41 km/h) |
| 95 mph (152.89 km/h) | 108.49 mph (174.6 km/h) |
| 100 mph (160.93 km/h) | 114.2 mph (183.79 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1715 | 1993 | 2146 | 2241 | 2343 | 2416 | 2496 | 2591 | 2723 | 2854 | 3000 | 3117 | 3328 | 3562 | 3744 | 3861 | 3927 | 4168 | 4504 | 5233 |
Better Fuel Economy Factory Ratios Increased Power
