Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 255/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 27.04 (686.7) | -1.77 (-45) -6.2% |
| Width inches (mm) | 12.01 (305) | 10.04 (255) | -1.97 (-50) -16.4% |
| Circum. inches (mm) | 90.5 (2298.7) | 84.93 (2157.33) | -5.57 (-141.37) -6.2% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 4.52 (114.75) | -0.89 (-22.5) -16.4% |
| Revolutions per mile (km) | 700.11 (435.03) | 745.99 (463.53) | 45.88 (28.51) 6.6% |
255/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.77 mph (30.21 km/h) |
| 25 mph (40.23 km/h) | 23.46 mph (37.76 km/h) |
| 30 mph (48.28 km/h) | 28.15 mph (45.31 km/h) |
| 35 mph (56.33 km/h) | 32.85 mph (52.86 km/h) |
| 40 mph (64.37 km/h) | 37.54 mph (60.41 km/h) |
| 45 mph (72.42 km/h) | 42.23 mph (67.97 km/h) |
| 50 mph (80.47 km/h) | 46.92 mph (75.52 km/h) |
| 55 mph (88.51 km/h) | 51.62 mph (83.07 km/h) |
| 60 mph (96.56 km/h) | 56.31 mph (90.62 km/h) |
| 65 mph (104.61 km/h) | 61 mph (98.17 km/h) |
| 70 mph (112.65 km/h) | 65.69 mph (105.73 km/h) |
| 75 mph (120.7 km/h) | 70.39 mph (113.28 km/h) |
| 80 mph (128.75 km/h) | 75.08 mph (120.83 km/h) |
| 85 mph (136.79 km/h) | 79.77 mph (128.38 km/h) |
| 90 mph (144.84 km/h) | 84.46 mph (135.93 km/h) |
| 95 mph (152.89 km/h) | 89.16 mph (143.49 km/h) |
| 100 mph (160.93 km/h) | 93.85 mph (151.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1898 | 2205 | 2375 | 2480 | 2593 | 2674 | 2763 | 2868 | 3013 | 3159 | 3320 | 3449 | 3684 | 3942 | 4144 | 4273 | 4346 | 4613 | 4984 | 5792 |
Better Fuel Economy Factory Ratios Increased Power
