Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 195/65-15 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.98 (634.5) | 25.09 (637.2) | 0.11 (2.7) 0.4% |
| Width inches (mm) | 7.68 (195) | 8.86 (225) | 1.18 (30) 15.4% |
| Circum. inches (mm) | 78.48 (1993.34) | 78.81 (2001.82) | 0.33 (8.48) 0.4% |
| Sidewall Height inches (mm) | 4.99 (126.75) | 3.54 (90) | -1.45 (-36.75) -29% |
| Revolutions per mile (km) | 807.36 (501.67) | 803.94 (499.54) | -3.42 (-2.13) -0.4% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.09 mph (32.32 km/h) |
| 25 mph (40.23 km/h) | 25.11 mph (40.4 km/h) |
| 30 mph (48.28 km/h) | 30.13 mph (48.49 km/h) |
| 35 mph (56.33 km/h) | 35.15 mph (56.57 km/h) |
| 40 mph (64.37 km/h) | 40.17 mph (64.65 km/h) |
| 45 mph (72.42 km/h) | 45.19 mph (72.73 km/h) |
| 50 mph (80.47 km/h) | 50.21 mph (80.81 km/h) |
| 55 mph (88.51 km/h) | 55.23 mph (88.89 km/h) |
| 60 mph (96.56 km/h) | 60.26 mph (96.97 km/h) |
| 65 mph (104.61 km/h) | 65.28 mph (105.05 km/h) |
| 70 mph (112.65 km/h) | 70.3 mph (113.13 km/h) |
| 75 mph (120.7 km/h) | 75.32 mph (121.21 km/h) |
| 80 mph (128.75 km/h) | 80.34 mph (129.3 km/h) |
| 85 mph (136.79 km/h) | 85.36 mph (137.38 km/h) |
| 90 mph (144.84 km/h) | 90.38 mph (145.46 km/h) |
| 95 mph (152.89 km/h) | 95.4 mph (153.54 km/h) |
| 100 mph (160.93 km/h) | 100.43 mph (161.62 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
