Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 315/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 39.84 (1012) | 13.64 (346.5) 52.1% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 82.31 (2090.73) | 125.17 (3179.29) | 42.86 (1088.56) 52.1% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 9.92 (252) | 6.82 (173.25) 220% |
| Revolutions per mile (km) | 769.75 (478.3) | 506.2 (314.53) | -263.56 (-163.77) -34.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 30.41 mph (48.95 km/h) |
| 25 mph (40.23 km/h) | 38.02 mph (61.18 km/h) |
| 30 mph (48.28 km/h) | 45.62 mph (73.42 km/h) |
| 35 mph (56.33 km/h) | 53.22 mph (85.65 km/h) |
| 40 mph (64.37 km/h) | 60.83 mph (97.89 km/h) |
| 45 mph (72.42 km/h) | 68.43 mph (110.13 km/h) |
| 50 mph (80.47 km/h) | 76.03 mph (122.36 km/h) |
| 55 mph (88.51 km/h) | 83.64 mph (134.6 km/h) |
| 60 mph (96.56 km/h) | 91.24 mph (146.84 km/h) |
| 65 mph (104.61 km/h) | 98.84 mph (159.07 km/h) |
| 70 mph (112.65 km/h) | 106.45 mph (171.31 km/h) |
| 75 mph (120.7 km/h) | 114.05 mph (183.55 km/h) |
| 80 mph (128.75 km/h) | 121.65 mph (195.78 km/h) |
| 85 mph (136.79 km/h) | 129.26 mph (208.02 km/h) |
| 90 mph (144.84 km/h) | 136.86 mph (220.25 km/h) |
| 95 mph (152.89 km/h) | 144.46 mph (232.49 km/h) |
| 100 mph (160.93 km/h) | 152.07 mph (244.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1288 | 1496 | 1612 | 1683 | 1760 | 1814 | 1875 | 1946 | 2045 | 2143 | 2253 | 2341 | 2500 | 2675 | 2812 | 2900 | 2949 | 3130 | 3382 | 3930 |
Better Fuel Economy Factory Ratios Increased Power
