Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 250/40-18 | 250/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.87 (657.2) | 27.87 (708) | 2 (50.8) 7.7% |
| Width inches (mm) | 9.84 (250) | 9.84 (250) | 0 (0) 0% |
| Circum. inches (mm) | 81.29 (2064.65) | 87.57 (2224.25) | 6.28 (159.59) 7.7% |
| Sidewall Height inches (mm) | 3.94 (100) | 3.94 (100) | 0 (0) 0% |
| Revolutions per mile (km) | 779.47 (484.34) | 723.55 (449.59) | -55.93 (-34.75) -7.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.55 mph (34.67 km/h) |
| 25 mph (40.23 km/h) | 26.93 mph (43.34 km/h) |
| 30 mph (48.28 km/h) | 32.32 mph (52.01 km/h) |
| 35 mph (56.33 km/h) | 37.71 mph (60.68 km/h) |
| 40 mph (64.37 km/h) | 43.09 mph (69.35 km/h) |
| 45 mph (72.42 km/h) | 48.48 mph (78.02 km/h) |
| 50 mph (80.47 km/h) | 53.86 mph (86.69 km/h) |
| 55 mph (88.51 km/h) | 59.25 mph (95.36 km/h) |
| 60 mph (96.56 km/h) | 64.64 mph (104.02 km/h) |
| 65 mph (104.61 km/h) | 70.02 mph (112.69 km/h) |
| 70 mph (112.65 km/h) | 75.41 mph (121.36 km/h) |
| 75 mph (120.7 km/h) | 80.8 mph (130.03 km/h) |
| 80 mph (128.75 km/h) | 86.18 mph (138.7 km/h) |
| 85 mph (136.79 km/h) | 91.57 mph (147.37 km/h) |
| 90 mph (144.84 km/h) | 96.96 mph (156.04 km/h) |
| 95 mph (152.89 km/h) | 102.34 mph (164.71 km/h) |
| 100 mph (160.93 km/h) | 107.73 mph (173.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1841 | 2139 | 2304 | 2405 | 2515 | 2593 | 2680 | 2782 | 2923 | 3064 | 3220 | 3346 | 3573 | 3824 | 4019 | 4145 | 4215 | 4474 | 4834 | 5618 |
Better Fuel Economy Factory Ratios Increased Power
