Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 240/45-18 | 255/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 27.04 (686.7) | 0.53 (13.5) 2% |
| Width inches (mm) | 9.45 (240) | 10.04 (255) | 0.59 (15) 6.2% |
| Circum. inches (mm) | 83.26 (2114.92) | 84.93 (2157.33) | 1.67 (42.41) 2% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.52 (114.75) | 0.27 (6.75) 6.2% |
| Revolutions per mile (km) | 760.95 (472.83) | 745.99 (463.53) | -14.96 (-9.3) -2% |
255/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.83 km/h) |
| 25 mph (40.23 km/h) | 25.5 mph (41.04 km/h) |
| 30 mph (48.28 km/h) | 30.6 mph (49.25 km/h) |
| 35 mph (56.33 km/h) | 35.7 mph (57.46 km/h) |
| 40 mph (64.37 km/h) | 40.8 mph (65.66 km/h) |
| 45 mph (72.42 km/h) | 45.9 mph (73.87 km/h) |
| 50 mph (80.47 km/h) | 51 mph (82.08 km/h) |
| 55 mph (88.51 km/h) | 56.1 mph (90.29 km/h) |
| 60 mph (96.56 km/h) | 61.2 mph (98.5 km/h) |
| 65 mph (104.61 km/h) | 66.3 mph (106.71 km/h) |
| 70 mph (112.65 km/h) | 71.4 mph (114.91 km/h) |
| 75 mph (120.7 km/h) | 76.5 mph (123.12 km/h) |
| 80 mph (128.75 km/h) | 81.6 mph (131.33 km/h) |
| 85 mph (136.79 km/h) | 86.7 mph (139.54 km/h) |
| 90 mph (144.84 km/h) | 91.8 mph (147.75 km/h) |
| 95 mph (152.89 km/h) | 96.91 mph (155.95 km/h) |
| 100 mph (160.93 km/h) | 102.01 mph (164.16 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
