Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/70-18 | 315/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.91 (912.2) | 34.12 (866.7) | -1.79 (-45.5) -5% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 112.83 (2865.76) | 107.2 (2722.82) | -5.63 (-142.94) -5% |
| Sidewall Height inches (mm) | 8.96 (227.5) | 8.06 (204.75) | -0.9 (-22.75) -10% |
| Revolutions per mile (km) | 561.58 (348.95) | 591.06 (367.27) | 29.48 (18.32) 5.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19 mph (30.58 km/h) |
| 25 mph (40.23 km/h) | 23.75 mph (38.23 km/h) |
| 30 mph (48.28 km/h) | 28.5 mph (45.87 km/h) |
| 35 mph (56.33 km/h) | 33.25 mph (53.52 km/h) |
| 40 mph (64.37 km/h) | 38 mph (61.16 km/h) |
| 45 mph (72.42 km/h) | 42.76 mph (68.81 km/h) |
| 50 mph (80.47 km/h) | 47.51 mph (76.45 km/h) |
| 55 mph (88.51 km/h) | 52.26 mph (84.1 km/h) |
| 60 mph (96.56 km/h) | 57.01 mph (91.74 km/h) |
| 65 mph (104.61 km/h) | 61.76 mph (99.39 km/h) |
| 70 mph (112.65 km/h) | 66.51 mph (107.04 km/h) |
| 75 mph (120.7 km/h) | 71.26 mph (114.68 km/h) |
| 80 mph (128.75 km/h) | 76.01 mph (122.33 km/h) |
| 85 mph (136.79 km/h) | 80.76 mph (129.97 km/h) |
| 90 mph (144.84 km/h) | 85.51 mph (137.62 km/h) |
| 95 mph (152.89 km/h) | 90.26 mph (145.26 km/h) |
| 100 mph (160.93 km/h) | 95.01 mph (152.91 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1504 | 1747 | 1882 | 1965 | 2055 | 2119 | 2189 | 2272 | 2387 | 2503 | 2631 | 2733 | 2919 | 3123 | 3283 | 3386 | 3443 | 3655 | 3949 | 4589 |
Better Fuel Economy Factory Ratios Increased Power
