Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/30-20 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.31 (643) | 25.97 (659.7) | 0.66 (16.7) 2.6% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 79.53 (2020.04) | 81.59 (2072.51) | 2.07 (52.46) 2.6% |
| Sidewall Height inches (mm) | 2.66 (67.5) | 3.99 (101.25) | 1.33 (33.75) 50% |
| Revolutions per mile (km) | 796.69 (495.04) | 776.52 (482.51) | -20.17 (-12.53) -2.5% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.52 mph (33.02 km/h) |
| 25 mph (40.23 km/h) | 25.65 mph (41.28 km/h) |
| 30 mph (48.28 km/h) | 30.78 mph (49.53 km/h) |
| 35 mph (56.33 km/h) | 35.91 mph (57.79 km/h) |
| 40 mph (64.37 km/h) | 41.04 mph (66.05 km/h) |
| 45 mph (72.42 km/h) | 46.17 mph (74.3 km/h) |
| 50 mph (80.47 km/h) | 51.3 mph (82.56 km/h) |
| 55 mph (88.51 km/h) | 56.43 mph (90.81 km/h) |
| 60 mph (96.56 km/h) | 61.56 mph (99.07 km/h) |
| 65 mph (104.61 km/h) | 66.69 mph (107.32 km/h) |
| 70 mph (112.65 km/h) | 71.82 mph (115.58 km/h) |
| 75 mph (120.7 km/h) | 76.95 mph (123.84 km/h) |
| 80 mph (128.75 km/h) | 82.08 mph (132.09 km/h) |
| 85 mph (136.79 km/h) | 87.21 mph (140.35 km/h) |
| 90 mph (144.84 km/h) | 92.34 mph (148.6 km/h) |
| 95 mph (152.89 km/h) | 97.47 mph (156.86 km/h) |
| 100 mph (160.93 km/h) | 102.6 mph (165.11 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
