Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-20 | 315/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.4 (670.5) | 38.6 (980.5) | 12.2 (310) 46.2% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 82.93 (2106.44) | 121.27 (3080.33) | 38.34 (973.89) 46.2% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 9.3 (236.25) | 6.1 (155) 190.8% |
| Revolutions per mile (km) | 764.01 (474.73) | 522.46 (324.64) | -241.55 (-150.09) -31.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 29.25 mph (47.07 km/h) |
| 25 mph (40.23 km/h) | 36.56 mph (58.84 km/h) |
| 30 mph (48.28 km/h) | 43.87 mph (70.6 km/h) |
| 35 mph (56.33 km/h) | 51.18 mph (82.37 km/h) |
| 40 mph (64.37 km/h) | 58.49 mph (94.14 km/h) |
| 45 mph (72.42 km/h) | 65.81 mph (105.9 km/h) |
| 50 mph (80.47 km/h) | 73.12 mph (117.67 km/h) |
| 55 mph (88.51 km/h) | 80.43 mph (129.44 km/h) |
| 60 mph (96.56 km/h) | 87.74 mph (141.2 km/h) |
| 65 mph (104.61 km/h) | 95.05 mph (152.97 km/h) |
| 70 mph (112.65 km/h) | 102.36 mph (164.74 km/h) |
| 75 mph (120.7 km/h) | 109.68 mph (176.51 km/h) |
| 80 mph (128.75 km/h) | 116.99 mph (188.27 km/h) |
| 85 mph (136.79 km/h) | 124.3 mph (200.04 km/h) |
| 90 mph (144.84 km/h) | 131.61 mph (211.81 km/h) |
| 95 mph (152.89 km/h) | 138.92 mph (223.57 km/h) |
| 100 mph (160.93 km/h) | 146.23 mph (235.34 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
