Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/30-20 | 225/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.31 (643) | 27.09 (688) | 1.77 (45) 7% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 79.53 (2020.04) | 85.1 (2161.42) | 5.57 (141.37) 7% |
| Sidewall Height inches (mm) | 2.66 (67.5) | 3.54 (90) | 0.89 (22.5) 33.3% |
| Revolutions per mile (km) | 796.69 (495.04) | 744.58 (462.66) | -52.11 (-32.38) -6.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.4 mph (34.44 km/h) |
| 25 mph (40.23 km/h) | 26.75 mph (43.05 km/h) |
| 30 mph (48.28 km/h) | 32.1 mph (51.66 km/h) |
| 35 mph (56.33 km/h) | 37.45 mph (60.27 km/h) |
| 40 mph (64.37 km/h) | 42.8 mph (68.88 km/h) |
| 45 mph (72.42 km/h) | 48.15 mph (77.49 km/h) |
| 50 mph (80.47 km/h) | 53.5 mph (86.1 km/h) |
| 55 mph (88.51 km/h) | 58.85 mph (94.71 km/h) |
| 60 mph (96.56 km/h) | 64.2 mph (103.32 km/h) |
| 65 mph (104.61 km/h) | 69.55 mph (111.93 km/h) |
| 70 mph (112.65 km/h) | 74.9 mph (120.54 km/h) |
| 75 mph (120.7 km/h) | 80.25 mph (129.15 km/h) |
| 80 mph (128.75 km/h) | 85.6 mph (137.76 km/h) |
| 85 mph (136.79 km/h) | 90.95 mph (146.37 km/h) |
| 90 mph (144.84 km/h) | 96.3 mph (154.98 km/h) |
| 95 mph (152.89 km/h) | 101.65 mph (163.59 km/h) |
| 100 mph (160.93 km/h) | 107 mph (172.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1895 | 2201 | 2371 | 2475 | 2588 | 2669 | 2758 | 2862 | 3008 | 3153 | 3314 | 3443 | 3677 | 3935 | 4136 | 4265 | 4338 | 4604 | 4975 | 5781 |
Better Fuel Economy Factory Ratios Increased Power
