Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 38.6 (980.5) | 12.4 (315) 47.3% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 121.27 (3080.33) | 38.96 (989.6) 47.3% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 9.3 (236.25) | 6.2 (157.5) 200% |
| Revolutions per mile (km) | 769.75 (478.3) | 522.46 (324.64) | -247.29 (-153.66) -32.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 29.47 mph (47.42 km/h) |
| 25 mph (40.23 km/h) | 36.83 mph (59.28 km/h) |
| 30 mph (48.28 km/h) | 44.2 mph (71.13 km/h) |
| 35 mph (56.33 km/h) | 51.57 mph (82.99 km/h) |
| 40 mph (64.37 km/h) | 58.93 mph (94.84 km/h) |
| 45 mph (72.42 km/h) | 66.3 mph (106.7 km/h) |
| 50 mph (80.47 km/h) | 73.67 mph (118.55 km/h) |
| 55 mph (88.51 km/h) | 81.03 mph (130.41 km/h) |
| 60 mph (96.56 km/h) | 88.4 mph (142.27 km/h) |
| 65 mph (104.61 km/h) | 95.77 mph (154.12 km/h) |
| 70 mph (112.65 km/h) | 103.13 mph (165.98 km/h) |
| 75 mph (120.7 km/h) | 110.5 mph (177.83 km/h) |
| 80 mph (128.75 km/h) | 117.87 mph (189.69 km/h) |
| 85 mph (136.79 km/h) | 125.23 mph (201.54 km/h) |
| 90 mph (144.84 km/h) | 132.6 mph (213.4 km/h) |
| 95 mph (152.89 km/h) | 139.97 mph (225.25 km/h) |
| 100 mph (160.93 km/h) | 147.33 mph (237.11 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1330 | 1545 | 1663 | 1737 | 1816 | 1873 | 1935 | 2008 | 2110 | 2212 | 2325 | 2416 | 2580 | 2761 | 2902 | 2993 | 3044 | 3231 | 3491 | 4057 |
Better Fuel Economy Factory Ratios Increased Power
