Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.77 (629.2) | 25.97 (659.7) | 1.2 (30.5) 4.8% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 77.82 (1976.69) | 81.59 (2072.51) | 3.77 (95.82) 4.8% |
| Sidewall Height inches (mm) | 3.39 (86) | 3.99 (101.25) | 0.6 (15.25) 17.7% |
| Revolutions per mile (km) | 814.16 (505.9) | 776.52 (482.51) | -37.64 (-23.39) -4.6% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.97 mph (33.75 km/h) |
| 25 mph (40.23 km/h) | 26.21 mph (42.18 km/h) |
| 30 mph (48.28 km/h) | 31.45 mph (50.62 km/h) |
| 35 mph (56.33 km/h) | 36.7 mph (59.06 km/h) |
| 40 mph (64.37 km/h) | 41.94 mph (67.49 km/h) |
| 45 mph (72.42 km/h) | 47.18 mph (75.93 km/h) |
| 50 mph (80.47 km/h) | 52.42 mph (84.37 km/h) |
| 55 mph (88.51 km/h) | 57.67 mph (92.8 km/h) |
| 60 mph (96.56 km/h) | 62.91 mph (101.24 km/h) |
| 65 mph (104.61 km/h) | 68.15 mph (109.68 km/h) |
| 70 mph (112.65 km/h) | 73.39 mph (118.12 km/h) |
| 75 mph (120.7 km/h) | 78.64 mph (126.55 km/h) |
| 80 mph (128.75 km/h) | 83.88 mph (134.99 km/h) |
| 85 mph (136.79 km/h) | 89.12 mph (143.43 km/h) |
| 90 mph (144.84 km/h) | 94.36 mph (151.86 km/h) |
| 95 mph (152.89 km/h) | 99.61 mph (160.3 km/h) |
| 100 mph (160.93 km/h) | 104.85 mph (168.74 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
