Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-19 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.09 (662.6) | 25.97 (659.7) | -0.11 (-2.9) -0.4% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 81.95 (2081.62) | 81.59 (2072.51) | -0.36 (-9.11) -0.4% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.99 (101.25) | 0.44 (11.25) 12.5% |
| Revolutions per mile (km) | 773.12 (480.39) | 776.52 (482.51) | 3.4 (2.11) 0.4% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.91 mph (32.05 km/h) |
| 25 mph (40.23 km/h) | 24.89 mph (40.06 km/h) |
| 30 mph (48.28 km/h) | 29.87 mph (48.07 km/h) |
| 35 mph (56.33 km/h) | 34.85 mph (56.08 km/h) |
| 40 mph (64.37 km/h) | 39.82 mph (64.09 km/h) |
| 45 mph (72.42 km/h) | 44.8 mph (72.1 km/h) |
| 50 mph (80.47 km/h) | 49.78 mph (80.12 km/h) |
| 55 mph (88.51 km/h) | 54.76 mph (88.13 km/h) |
| 60 mph (96.56 km/h) | 59.74 mph (96.14 km/h) |
| 65 mph (104.61 km/h) | 64.72 mph (104.15 km/h) |
| 70 mph (112.65 km/h) | 69.69 mph (112.16 km/h) |
| 75 mph (120.7 km/h) | 74.67 mph (120.17 km/h) |
| 80 mph (128.75 km/h) | 79.65 mph (128.18 km/h) |
| 85 mph (136.79 km/h) | 84.63 mph (136.2 km/h) |
| 90 mph (144.84 km/h) | 89.61 mph (144.21 km/h) |
| 95 mph (152.89 km/h) | 94.58 mph (152.22 km/h) |
| 100 mph (160.93 km/h) | 99.56 mph (160.23 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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