Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 25.97 (659.7) | -0.06 (-1.5) -0.2% |
| Width inches (mm) | 10.04 (255) | 8.86 (225) | -1.18 (-30) -11.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 81.59 (2072.51) | -0.19 (-4.71) -0.2% |
| Sidewall Height inches (mm) | 4.02 (102) | 3.99 (101.25) | -0.03 (-0.75) -0.7% |
| Revolutions per mile (km) | 774.76 (481.41) | 776.52 (482.51) | 1.76 (1.09) 0.2% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.95 mph (32.11 km/h) |
| 25 mph (40.23 km/h) | 24.94 mph (40.14 km/h) |
| 30 mph (48.28 km/h) | 29.93 mph (48.17 km/h) |
| 35 mph (56.33 km/h) | 34.92 mph (56.2 km/h) |
| 40 mph (64.37 km/h) | 39.91 mph (64.23 km/h) |
| 45 mph (72.42 km/h) | 44.9 mph (72.26 km/h) |
| 50 mph (80.47 km/h) | 49.89 mph (80.28 km/h) |
| 55 mph (88.51 km/h) | 54.88 mph (88.31 km/h) |
| 60 mph (96.56 km/h) | 59.86 mph (96.34 km/h) |
| 65 mph (104.61 km/h) | 64.85 mph (104.37 km/h) |
| 70 mph (112.65 km/h) | 69.84 mph (112.4 km/h) |
| 75 mph (120.7 km/h) | 74.83 mph (120.43 km/h) |
| 80 mph (128.75 km/h) | 79.82 mph (128.46 km/h) |
| 85 mph (136.79 km/h) | 84.81 mph (136.48 km/h) |
| 90 mph (144.84 km/h) | 89.8 mph (144.51 km/h) |
| 95 mph (152.89 km/h) | 94.78 mph (152.54 km/h) |
| 100 mph (160.93 km/h) | 99.77 mph (160.57 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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