Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-20 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.5) | 25.97 (659.7) | -2 (-50.8) -7.1% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 87.88 (2232.1) | 81.59 (2072.51) | -6.28 (-159.59) -7.1% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 3.99 (101.25) | 0 (0) 0% |
| Revolutions per mile (km) | 721 (448.01) | 776.52 (482.51) | 55.52 (34.5) 7.7% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.57 mph (29.89 km/h) |
| 25 mph (40.23 km/h) | 23.21 mph (37.36 km/h) |
| 30 mph (48.28 km/h) | 27.86 mph (44.83 km/h) |
| 35 mph (56.33 km/h) | 32.5 mph (52.3 km/h) |
| 40 mph (64.37 km/h) | 37.14 mph (59.77 km/h) |
| 45 mph (72.42 km/h) | 41.78 mph (67.24 km/h) |
| 50 mph (80.47 km/h) | 46.43 mph (74.71 km/h) |
| 55 mph (88.51 km/h) | 51.07 mph (82.19 km/h) |
| 60 mph (96.56 km/h) | 55.71 mph (89.66 km/h) |
| 65 mph (104.61 km/h) | 60.35 mph (97.13 km/h) |
| 70 mph (112.65 km/h) | 65 mph (104.6 km/h) |
| 75 mph (120.7 km/h) | 69.64 mph (112.07 km/h) |
| 80 mph (128.75 km/h) | 74.28 mph (119.54 km/h) |
| 85 mph (136.79 km/h) | 78.92 mph (127.01 km/h) |
| 90 mph (144.84 km/h) | 83.57 mph (134.49 km/h) |
| 95 mph (152.89 km/h) | 88.21 mph (141.96 km/h) |
| 100 mph (160.93 km/h) | 92.85 mph (149.43 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 |
Better Fuel Economy Factory Ratios Increased Power
