Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/50-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.46 (672.2) | 25.09 (637.2) | -1.38 (-35) -5.2% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 83.14 (2111.78) | 78.81 (2001.82) | -4.33 (-109.96) -5.2% |
| Sidewall Height inches (mm) | 4.23 (107.5) | 3.54 (90) | -0.69 (-17.5) -16.3% |
| Revolutions per mile (km) | 762.08 (473.53) | 803.94 (499.54) | 41.86 (26.01) 5.5% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.96 mph (30.51 km/h) |
| 25 mph (40.23 km/h) | 23.7 mph (38.14 km/h) |
| 30 mph (48.28 km/h) | 28.44 mph (45.77 km/h) |
| 35 mph (56.33 km/h) | 33.18 mph (53.39 km/h) |
| 40 mph (64.37 km/h) | 37.92 mph (61.02 km/h) |
| 45 mph (72.42 km/h) | 42.66 mph (68.65 km/h) |
| 50 mph (80.47 km/h) | 47.4 mph (76.28 km/h) |
| 55 mph (88.51 km/h) | 52.14 mph (83.91 km/h) |
| 60 mph (96.56 km/h) | 56.88 mph (91.53 km/h) |
| 65 mph (104.61 km/h) | 61.62 mph (99.16 km/h) |
| 70 mph (112.65 km/h) | 66.36 mph (106.79 km/h) |
| 75 mph (120.7 km/h) | 71.09 mph (114.42 km/h) |
| 80 mph (128.75 km/h) | 75.83 mph (122.04 km/h) |
| 85 mph (136.79 km/h) | 80.57 mph (129.67 km/h) |
| 90 mph (144.84 km/h) | 85.31 mph (137.3 km/h) |
| 95 mph (152.89 km/h) | 90.05 mph (144.93 km/h) |
| 100 mph (160.93 km/h) | 94.79 mph (152.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2046 | 2377 | 2560 | 2673 | 2795 | 2882 | 2977 | 3091 | 3247 | 3404 | 3578 | 3717 | 3970 | 4248 | 4466 | 4605 | 4684 | 4971 | 5372 | 6242 |
Better Fuel Economy Factory Ratios Increased Power
