Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-18 | 225/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.18 (715.7) | 25.97 (659.7) | -2.2 (-56) -7.8% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 88.52 (2248.44) | 81.59 (2072.51) | -6.93 (-175.93) -7.8% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 3.99 (101.25) | -1.1 (-28) -21.7% |
| Revolutions per mile (km) | 715.76 (444.75) | 776.52 (482.51) | 60.76 (37.75) 8.5% |
225/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.44 mph (29.67 km/h) |
| 25 mph (40.23 km/h) | 23.04 mph (37.09 km/h) |
| 30 mph (48.28 km/h) | 27.65 mph (44.5 km/h) |
| 35 mph (56.33 km/h) | 32.26 mph (51.92 km/h) |
| 40 mph (64.37 km/h) | 36.87 mph (59.34 km/h) |
| 45 mph (72.42 km/h) | 41.48 mph (66.75 km/h) |
| 50 mph (80.47 km/h) | 46.09 mph (74.17 km/h) |
| 55 mph (88.51 km/h) | 50.7 mph (81.59 km/h) |
| 60 mph (96.56 km/h) | 55.31 mph (89.01 km/h) |
| 65 mph (104.61 km/h) | 59.91 mph (96.42 km/h) |
| 70 mph (112.65 km/h) | 64.52 mph (103.84 km/h) |
| 75 mph (120.7 km/h) | 69.13 mph (111.26 km/h) |
| 80 mph (128.75 km/h) | 73.74 mph (118.67 km/h) |
| 85 mph (136.79 km/h) | 78.35 mph (126.09 km/h) |
| 90 mph (144.84 km/h) | 82.96 mph (133.51 km/h) |
| 95 mph (152.89 km/h) | 87.57 mph (140.93 km/h) |
| 100 mph (160.93 km/h) | 92.18 mph (148.34 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
