Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 315/50-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 29.4 (746.8) | 0.59 (15.1) 2.1% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 90.5 (2298.7) | 92.37 (2346.14) | 1.87 (47.44) 2.1% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 6.2 (157.5) | 0.8 (20.25) 14.8% |
| Revolutions per mile (km) | 700.11 (435.03) | 685.95 (426.23) | -14.16 (-8.8) -2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.41 mph (32.85 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.06 km/h) |
| 30 mph (48.28 km/h) | 30.62 mph (49.28 km/h) |
| 35 mph (56.33 km/h) | 35.72 mph (57.49 km/h) |
| 40 mph (64.37 km/h) | 40.83 mph (65.7 km/h) |
| 45 mph (72.42 km/h) | 45.93 mph (73.92 km/h) |
| 50 mph (80.47 km/h) | 51.03 mph (82.13 km/h) |
| 55 mph (88.51 km/h) | 56.14 mph (90.34 km/h) |
| 60 mph (96.56 km/h) | 61.24 mph (98.55 km/h) |
| 65 mph (104.61 km/h) | 66.34 mph (106.77 km/h) |
| 70 mph (112.65 km/h) | 71.44 mph (114.98 km/h) |
| 75 mph (120.7 km/h) | 76.55 mph (123.19 km/h) |
| 80 mph (128.75 km/h) | 81.65 mph (131.4 km/h) |
| 85 mph (136.79 km/h) | 86.75 mph (139.62 km/h) |
| 90 mph (144.84 km/h) | 91.86 mph (147.83 km/h) |
| 95 mph (152.89 km/h) | 96.96 mph (156.04 km/h) |
| 100 mph (160.93 km/h) | 102.06 mph (164.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1746 | 2028 | 2184 | 2280 | 2384 | 2459 | 2540 | 2637 | 2771 | 2904 | 3053 | 3172 | 3387 | 3625 | 3811 | 3930 | 3996 | 4241 | 4583 | 5326 |
Better Fuel Economy Factory Ratios Increased Power
