Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 240/40-18 | 240/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 26.5 (673.2) | 0.94 (24) 3.7% |
| Width inches (mm) | 9.45 (240) | 9.45 (240) | 0 (0) 0% |
| Circum. inches (mm) | 80.3 (2039.52) | 83.26 (2114.92) | 2.97 (75.4) 3.7% |
| Sidewall Height inches (mm) | 3.78 (96) | 4.25 (108) | 0.47 (12) 12.5% |
| Revolutions per mile (km) | 789.08 (490.31) | 760.95 (472.83) | -28.13 (-17.48) -3.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.74 mph (33.38 km/h) |
| 25 mph (40.23 km/h) | 25.92 mph (41.72 km/h) |
| 30 mph (48.28 km/h) | 31.11 mph (50.07 km/h) |
| 35 mph (56.33 km/h) | 36.29 mph (58.41 km/h) |
| 40 mph (64.37 km/h) | 41.48 mph (66.75 km/h) |
| 45 mph (72.42 km/h) | 46.66 mph (75.1 km/h) |
| 50 mph (80.47 km/h) | 51.85 mph (83.44 km/h) |
| 55 mph (88.51 km/h) | 57.03 mph (91.79 km/h) |
| 60 mph (96.56 km/h) | 62.22 mph (100.13 km/h) |
| 65 mph (104.61 km/h) | 67.4 mph (108.47 km/h) |
| 70 mph (112.65 km/h) | 72.59 mph (116.82 km/h) |
| 75 mph (120.7 km/h) | 77.77 mph (125.16 km/h) |
| 80 mph (128.75 km/h) | 82.96 mph (133.51 km/h) |
| 85 mph (136.79 km/h) | 88.14 mph (141.85 km/h) |
| 90 mph (144.84 km/h) | 93.33 mph (150.2 km/h) |
| 95 mph (152.89 km/h) | 98.51 mph (158.54 km/h) |
| 100 mph (160.93 km/h) | 103.7 mph (166.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1936 | 2250 | 2423 | 2530 | 2645 | 2728 | 2818 | 2925 | 3074 | 3222 | 3387 | 3519 | 3758 | 4021 | 4227 | 4359 | 4433 | 4705 | 5084 | 5908 |
Better Fuel Economy Factory Ratios Increased Power
