Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 315/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 37.36 (949) | 1.45 (36.8) 4% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 112.83 (2865.76) | 117.38 (2981.37) | 4.55 (115.61) 4% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.68 (220.5) | -0.28 (-7) -3.1% |
| Revolutions per mile (km) | 561.58 (348.95) | 539.8 (335.42) | -21.78 (-13.53) -3.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.81 mph (33.49 km/h) |
| 25 mph (40.23 km/h) | 26.01 mph (41.86 km/h) |
| 30 mph (48.28 km/h) | 31.21 mph (50.23 km/h) |
| 35 mph (56.33 km/h) | 36.41 mph (58.6 km/h) |
| 40 mph (64.37 km/h) | 41.61 mph (66.97 km/h) |
| 45 mph (72.42 km/h) | 46.82 mph (75.34 km/h) |
| 50 mph (80.47 km/h) | 52.02 mph (83.71 km/h) |
| 55 mph (88.51 km/h) | 57.22 mph (92.08 km/h) |
| 60 mph (96.56 km/h) | 62.42 mph (100.46 km/h) |
| 65 mph (104.61 km/h) | 67.62 mph (108.83 km/h) |
| 70 mph (112.65 km/h) | 72.82 mph (117.2 km/h) |
| 75 mph (120.7 km/h) | 78.03 mph (125.57 km/h) |
| 80 mph (128.75 km/h) | 83.23 mph (133.94 km/h) |
| 85 mph (136.79 km/h) | 88.43 mph (142.31 km/h) |
| 90 mph (144.84 km/h) | 93.63 mph (150.68 km/h) |
| 95 mph (152.89 km/h) | 98.83 mph (159.06 km/h) |
| 100 mph (160.93 km/h) | 104.03 mph (167.43 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1374 | 1596 | 1719 | 1795 | 1876 | 1935 | 1999 | 2075 | 2180 | 2286 | 2402 | 2496 | 2666 | 2853 | 2999 | 3092 | 3145 | 3338 | 3607 | 4191 |
Better Fuel Economy Factory Ratios Increased Power
