Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 240/40-18 | 280/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 26.82 (681.2) | 1.26 (32) 4.9% |
| Width inches (mm) | 9.45 (240) | 11.02 (280) | 1.57 (40) 16.7% |
| Circum. inches (mm) | 80.3 (2039.52) | 84.25 (2140.05) | 3.96 (100.53) 4.9% |
| Sidewall Height inches (mm) | 3.78 (96) | 4.41 (112) | 0.63 (16) 16.7% |
| Revolutions per mile (km) | 789.08 (490.31) | 752.01 (467.28) | -37.07 (-23.03) -4.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.99 mph (33.77 km/h) |
| 25 mph (40.23 km/h) | 26.23 mph (42.22 km/h) |
| 30 mph (48.28 km/h) | 31.48 mph (50.66 km/h) |
| 35 mph (56.33 km/h) | 36.73 mph (59.1 km/h) |
| 40 mph (64.37 km/h) | 41.97 mph (67.55 km/h) |
| 45 mph (72.42 km/h) | 47.22 mph (75.99 km/h) |
| 50 mph (80.47 km/h) | 52.46 mph (84.43 km/h) |
| 55 mph (88.51 km/h) | 57.71 mph (92.88 km/h) |
| 60 mph (96.56 km/h) | 62.96 mph (101.32 km/h) |
| 65 mph (104.61 km/h) | 68.2 mph (109.76 km/h) |
| 70 mph (112.65 km/h) | 73.45 mph (118.21 km/h) |
| 75 mph (120.7 km/h) | 78.7 mph (126.65 km/h) |
| 80 mph (128.75 km/h) | 83.94 mph (135.09 km/h) |
| 85 mph (136.79 km/h) | 89.19 mph (143.54 km/h) |
| 90 mph (144.84 km/h) | 94.44 mph (151.98 km/h) |
| 95 mph (152.89 km/h) | 99.68 mph (160.42 km/h) |
| 100 mph (160.93 km/h) | 104.93 mph (168.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1914 | 2223 | 2394 | 2500 | 2614 | 2696 | 2785 | 2891 | 3038 | 3184 | 3347 | 3477 | 3713 | 3974 | 4178 | 4308 | 4381 | 4650 | 5025 | 5839 |
Better Fuel Economy Factory Ratios Increased Power
