Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/55-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.01 (660.7) | 25.97 (659.7) | -0.04 (-1) -0.2% |
| Width inches (mm) | 7.28 (185) | 8.86 (225) | 1.57 (40) 21.6% |
| Circum. inches (mm) | 81.72 (2075.65) | 81.59 (2072.51) | -0.12 (-3.14) -0.2% |
| Sidewall Height inches (mm) | 4.01 (101.75) | 3.99 (101.25) | -0.02 (-0.5) -0.5% |
| Revolutions per mile (km) | 775.34 (481.78) | 776.52 (482.51) | 1.18 (0.73) 0.2% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.97 mph (32.14 km/h) |
| 25 mph (40.23 km/h) | 24.96 mph (40.17 km/h) |
| 30 mph (48.28 km/h) | 29.95 mph (48.21 km/h) |
| 35 mph (56.33 km/h) | 34.95 mph (56.24 km/h) |
| 40 mph (64.37 km/h) | 39.94 mph (64.28 km/h) |
| 45 mph (72.42 km/h) | 44.93 mph (72.31 km/h) |
| 50 mph (80.47 km/h) | 49.92 mph (80.35 km/h) |
| 55 mph (88.51 km/h) | 54.92 mph (88.38 km/h) |
| 60 mph (96.56 km/h) | 59.91 mph (96.41 km/h) |
| 65 mph (104.61 km/h) | 64.9 mph (104.45 km/h) |
| 70 mph (112.65 km/h) | 69.89 mph (112.48 km/h) |
| 75 mph (120.7 km/h) | 74.89 mph (120.52 km/h) |
| 80 mph (128.75 km/h) | 79.88 mph (128.55 km/h) |
| 85 mph (136.79 km/h) | 84.87 mph (136.59 km/h) |
| 90 mph (144.84 km/h) | 89.86 mph (144.62 km/h) |
| 95 mph (152.89 km/h) | 94.86 mph (152.66 km/h) |
| 100 mph (160.93 km/h) | 99.85 mph (160.69 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
