Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-20 | 225/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.72 (704) | 29.74 (755.5) | 2.03 (51.5) 7.3% |
| Width inches (mm) | 9.65 (245) | 8.86 (225) | -0.79 (-20) -8.2% |
| Circum. inches (mm) | 87.07 (2211.68) | 93.44 (2373.47) | 6.37 (161.79) 7.3% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.87 (123.75) | 1.01 (25.75) 26.3% |
| Revolutions per mile (km) | 727.66 (452.14) | 678.05 (421.32) | -49.6 (-30.82) -6.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.46 mph (34.54 km/h) |
| 25 mph (40.23 km/h) | 26.83 mph (43.18 km/h) |
| 30 mph (48.28 km/h) | 32.19 mph (51.81 km/h) |
| 35 mph (56.33 km/h) | 37.56 mph (60.45 km/h) |
| 40 mph (64.37 km/h) | 42.93 mph (69.08 km/h) |
| 45 mph (72.42 km/h) | 48.29 mph (77.72 km/h) |
| 50 mph (80.47 km/h) | 53.66 mph (86.35 km/h) |
| 55 mph (88.51 km/h) | 59.02 mph (94.99 km/h) |
| 60 mph (96.56 km/h) | 64.39 mph (103.62 km/h) |
| 65 mph (104.61 km/h) | 69.75 mph (112.26 km/h) |
| 70 mph (112.65 km/h) | 75.12 mph (120.9 km/h) |
| 75 mph (120.7 km/h) | 80.49 mph (129.53 km/h) |
| 80 mph (128.75 km/h) | 85.85 mph (138.17 km/h) |
| 85 mph (136.79 km/h) | 91.22 mph (146.8 km/h) |
| 90 mph (144.84 km/h) | 96.58 mph (155.44 km/h) |
| 95 mph (152.89 km/h) | 101.95 mph (164.07 km/h) |
| 100 mph (160.93 km/h) | 107.32 mph (172.71 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1726 | 2005 | 2159 | 2254 | 2357 | 2430 | 2511 | 2607 | 2739 | 2871 | 3018 | 3135 | 3348 | 3583 | 3767 | 3884 | 3950 | 4193 | 4530 | 5265 |
Better Fuel Economy Factory Ratios Increased Power
