Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 225/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 28.86 (733) | -0.11 (-2.9) -0.4% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 91.02 (2311.9) | 90.66 (2302.79) | -0.36 (-9.11) -0.4% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 4.43 (112.5) | 0.44 (11.25) 11.1% |
| Revolutions per mile (km) | 696.11 (432.54) | 698.87 (434.26) | 2.75 (1.71) 0.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.92 mph (32.06 km/h) |
| 25 mph (40.23 km/h) | 24.9 mph (40.08 km/h) |
| 30 mph (48.28 km/h) | 29.88 mph (48.09 km/h) |
| 35 mph (56.33 km/h) | 34.86 mph (56.11 km/h) |
| 40 mph (64.37 km/h) | 39.84 mph (64.12 km/h) |
| 45 mph (72.42 km/h) | 44.82 mph (72.14 km/h) |
| 50 mph (80.47 km/h) | 49.8 mph (80.15 km/h) |
| 55 mph (88.51 km/h) | 54.78 mph (88.17 km/h) |
| 60 mph (96.56 km/h) | 59.76 mph (96.18 km/h) |
| 65 mph (104.61 km/h) | 64.74 mph (104.2 km/h) |
| 70 mph (112.65 km/h) | 69.72 mph (112.21 km/h) |
| 75 mph (120.7 km/h) | 74.7 mph (120.23 km/h) |
| 80 mph (128.75 km/h) | 79.68 mph (128.24 km/h) |
| 85 mph (136.79 km/h) | 84.67 mph (136.26 km/h) |
| 90 mph (144.84 km/h) | 89.65 mph (144.27 km/h) |
| 95 mph (152.89 km/h) | 94.63 mph (152.29 km/h) |
| 100 mph (160.93 km/h) | 99.61 mph (160.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1778 | 2066 | 2225 | 2323 | 2429 | 2505 | 2588 | 2687 | 2823 | 2959 | 3110 | 3232 | 3451 | 3693 | 3882 | 4003 | 4072 | 4321 | 4669 | 5426 |
Better Fuel Economy Factory Ratios Increased Power
