Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 25.97 (659.7) | 0.89 (22.5) 3.5% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 78.81 (2001.82) | 81.59 (2072.51) | 2.78 (70.69) 3.5% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.99 (101.25) | 0.44 (11.25) 12.5% |
| Revolutions per mile (km) | 803.94 (499.54) | 776.52 (482.51) | -27.42 (-17.04) -3.4% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.71 mph (33.32 km/h) |
| 25 mph (40.23 km/h) | 25.88 mph (41.65 km/h) |
| 30 mph (48.28 km/h) | 31.06 mph (49.99 km/h) |
| 35 mph (56.33 km/h) | 36.24 mph (58.32 km/h) |
| 40 mph (64.37 km/h) | 41.41 mph (66.65 km/h) |
| 45 mph (72.42 km/h) | 46.59 mph (74.98 km/h) |
| 50 mph (80.47 km/h) | 51.77 mph (83.31 km/h) |
| 55 mph (88.51 km/h) | 56.94 mph (91.64 km/h) |
| 60 mph (96.56 km/h) | 62.12 mph (99.97 km/h) |
| 65 mph (104.61 km/h) | 67.3 mph (108.3 km/h) |
| 70 mph (112.65 km/h) | 72.47 mph (116.63 km/h) |
| 75 mph (120.7 km/h) | 77.65 mph (124.96 km/h) |
| 80 mph (128.75 km/h) | 82.82 mph (133.29 km/h) |
| 85 mph (136.79 km/h) | 88 mph (141.62 km/h) |
| 90 mph (144.84 km/h) | 93.18 mph (149.96 km/h) |
| 95 mph (152.89 km/h) | 98.35 mph (158.29 km/h) |
| 100 mph (160.93 km/h) | 103.53 mph (166.62 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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