Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 250/40-18 | 240/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.87 (657.2) | 31.23 (793.2) | 5.35 (136) 20.7% |
| Width inches (mm) | 9.84 (250) | 9.45 (240) | -0.39 (-10) -4% |
| Circum. inches (mm) | 81.29 (2064.65) | 98.11 (2491.91) | 16.82 (427.26) 20.7% |
| Sidewall Height inches (mm) | 3.94 (100) | 6.61 (168) | 2.68 (68) 68% |
| Revolutions per mile (km) | 779.47 (484.34) | 645.83 (401.3) | -133.65 (-83.04) -17.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.14 mph (38.85 km/h) |
| 25 mph (40.23 km/h) | 30.17 mph (48.56 km/h) |
| 30 mph (48.28 km/h) | 36.21 mph (58.27 km/h) |
| 35 mph (56.33 km/h) | 42.24 mph (67.98 km/h) |
| 40 mph (64.37 km/h) | 48.28 mph (77.7 km/h) |
| 45 mph (72.42 km/h) | 54.31 mph (87.41 km/h) |
| 50 mph (80.47 km/h) | 60.35 mph (97.12 km/h) |
| 55 mph (88.51 km/h) | 66.38 mph (106.83 km/h) |
| 60 mph (96.56 km/h) | 72.42 mph (116.54 km/h) |
| 65 mph (104.61 km/h) | 78.45 mph (126.25 km/h) |
| 70 mph (112.65 km/h) | 84.49 mph (135.97 km/h) |
| 75 mph (120.7 km/h) | 90.52 mph (145.68 km/h) |
| 80 mph (128.75 km/h) | 96.56 mph (155.39 km/h) |
| 85 mph (136.79 km/h) | 102.59 mph (165.1 km/h) |
| 90 mph (144.84 km/h) | 108.62 mph (174.81 km/h) |
| 95 mph (152.89 km/h) | 114.66 mph (184.53 km/h) |
| 100 mph (160.93 km/h) | 120.69 mph (194.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1644 | 1909 | 2056 | 2147 | 2245 | 2315 | 2392 | 2483 | 2609 | 2735 | 2874 | 2986 | 3189 | 3413 | 3588 | 3700 | 3763 | 3993 | 4315 | 5014 |
Better Fuel Economy Factory Ratios Increased Power
