Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 250/40-18 | 240/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.87 (657.2) | 25.56 (649.2) | -0.31 (-8) -1.2% |
| Width inches (mm) | 9.84 (250) | 9.45 (240) | -0.39 (-10) -4% |
| Circum. inches (mm) | 81.29 (2064.65) | 80.3 (2039.52) | -0.99 (-25.13) -1.2% |
| Sidewall Height inches (mm) | 3.94 (100) | 3.78 (96) | -0.16 (-4) -4% |
| Revolutions per mile (km) | 779.47 (484.34) | 789.08 (490.31) | 9.61 (5.97) 1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.76 mph (31.8 km/h) |
| 25 mph (40.23 km/h) | 24.7 mph (39.74 km/h) |
| 30 mph (48.28 km/h) | 29.63 mph (47.69 km/h) |
| 35 mph (56.33 km/h) | 34.57 mph (55.64 km/h) |
| 40 mph (64.37 km/h) | 39.51 mph (63.59 km/h) |
| 45 mph (72.42 km/h) | 44.45 mph (71.54 km/h) |
| 50 mph (80.47 km/h) | 49.39 mph (79.49 km/h) |
| 55 mph (88.51 km/h) | 54.33 mph (87.44 km/h) |
| 60 mph (96.56 km/h) | 59.27 mph (95.39 km/h) |
| 65 mph (104.61 km/h) | 64.21 mph (103.33 km/h) |
| 70 mph (112.65 km/h) | 69.15 mph (111.28 km/h) |
| 75 mph (120.7 km/h) | 74.09 mph (119.23 km/h) |
| 80 mph (128.75 km/h) | 79.03 mph (127.18 km/h) |
| 85 mph (136.79 km/h) | 83.97 mph (135.13 km/h) |
| 90 mph (144.84 km/h) | 88.9 mph (143.08 km/h) |
| 95 mph (152.89 km/h) | 93.84 mph (151.03 km/h) |
| 100 mph (160.93 km/h) | 98.78 mph (158.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2008 | 2333 | 2512 | 2623 | 2743 | 2828 | 2922 | 3033 | 3187 | 3341 | 3512 | 3649 | 3896 | 4170 | 4384 | 4520 | 4597 | 4879 | 5272 | 6127 |
Better Fuel Economy Factory Ratios Increased Power
