Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 33.64 (854.5) | 7.44 (189) 28.4% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 105.69 (2684.49) | 23.38 (593.76) 28.4% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 6.82 (173.25) | 3.72 (94.5) 120% |
| Revolutions per mile (km) | 769.75 (478.3) | 599.5 (372.51) | -170.26 (-105.79) -22.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.68 mph (41.33 km/h) |
| 25 mph (40.23 km/h) | 32.1 mph (51.66 km/h) |
| 30 mph (48.28 km/h) | 38.52 mph (61.99 km/h) |
| 35 mph (56.33 km/h) | 44.94 mph (72.32 km/h) |
| 40 mph (64.37 km/h) | 51.36 mph (82.66 km/h) |
| 45 mph (72.42 km/h) | 57.78 mph (92.99 km/h) |
| 50 mph (80.47 km/h) | 64.2 mph (103.32 km/h) |
| 55 mph (88.51 km/h) | 70.62 mph (113.65 km/h) |
| 60 mph (96.56 km/h) | 77.04 mph (123.98 km/h) |
| 65 mph (104.61 km/h) | 83.46 mph (134.32 km/h) |
| 70 mph (112.65 km/h) | 89.88 mph (144.65 km/h) |
| 75 mph (120.7 km/h) | 96.3 mph (154.98 km/h) |
| 80 mph (128.75 km/h) | 102.72 mph (165.31 km/h) |
| 85 mph (136.79 km/h) | 109.14 mph (175.64 km/h) |
| 90 mph (144.84 km/h) | 115.56 mph (185.98 km/h) |
| 95 mph (152.89 km/h) | 121.98 mph (196.31 km/h) |
| 100 mph (160.93 km/h) | 128.4 mph (206.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1526 | 1772 | 1909 | 1993 | 2084 | 2149 | 2220 | 2305 | 2421 | 2538 | 2668 | 2772 | 2960 | 3168 | 3330 | 3434 | 3493 | 3707 | 4006 | 4655 |
Better Fuel Economy Factory Ratios Increased Power
