Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 240/40-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 25.97 (659.7) | 0.41 (10.5) 1.6% |
| Width inches (mm) | 9.45 (240) | 8.86 (225) | -0.59 (-15) -6.3% |
| Circum. inches (mm) | 80.3 (2039.52) | 81.59 (2072.51) | 1.3 (32.99) 1.6% |
| Sidewall Height inches (mm) | 3.78 (96) | 3.99 (101.25) | 0.21 (5.25) 5.5% |
| Revolutions per mile (km) | 789.08 (490.31) | 776.52 (482.51) | -12.56 (-7.8) -1.6% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.32 mph (32.71 km/h) |
| 25 mph (40.23 km/h) | 25.4 mph (40.88 km/h) |
| 30 mph (48.28 km/h) | 30.49 mph (49.06 km/h) |
| 35 mph (56.33 km/h) | 35.57 mph (57.24 km/h) |
| 40 mph (64.37 km/h) | 40.65 mph (65.42 km/h) |
| 45 mph (72.42 km/h) | 45.73 mph (73.59 km/h) |
| 50 mph (80.47 km/h) | 50.81 mph (81.77 km/h) |
| 55 mph (88.51 km/h) | 55.89 mph (89.95 km/h) |
| 60 mph (96.56 km/h) | 60.97 mph (98.12 km/h) |
| 65 mph (104.61 km/h) | 66.05 mph (106.3 km/h) |
| 70 mph (112.65 km/h) | 71.13 mph (114.48 km/h) |
| 75 mph (120.7 km/h) | 76.21 mph (122.65 km/h) |
| 80 mph (128.75 km/h) | 81.29 mph (130.83 km/h) |
| 85 mph (136.79 km/h) | 86.37 mph (139.01 km/h) |
| 90 mph (144.84 km/h) | 91.46 mph (147.18 km/h) |
| 95 mph (152.89 km/h) | 96.54 mph (155.36 km/h) |
| 100 mph (160.93 km/h) | 101.62 mph (163.54 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1976 | 2296 | 2472 | 2582 | 2699 | 2783 | 2876 | 2985 | 3137 | 3288 | 3456 | 3591 | 3834 | 4104 | 4314 | 4448 | 4524 | 4801 | 5188 | 6029 |
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