Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 225/55-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 30.74 (780.9) | 1.77 (45) 6.1% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 91.02 (2311.9) | 96.59 (2453.27) | 5.57 (141.37) 6.1% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 4.87 (123.75) | 0.89 (22.5) 22.2% |
| Revolutions per mile (km) | 696.11 (432.54) | 656 (407.62) | -40.11 (-24.93) -5.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.22 mph (34.16 km/h) |
| 25 mph (40.23 km/h) | 26.53 mph (42.69 km/h) |
| 30 mph (48.28 km/h) | 31.83 mph (51.23 km/h) |
| 35 mph (56.33 km/h) | 37.14 mph (59.77 km/h) |
| 40 mph (64.37 km/h) | 42.45 mph (68.31 km/h) |
| 45 mph (72.42 km/h) | 47.75 mph (76.85 km/h) |
| 50 mph (80.47 km/h) | 53.06 mph (85.39 km/h) |
| 55 mph (88.51 km/h) | 58.36 mph (93.93 km/h) |
| 60 mph (96.56 km/h) | 63.67 mph (102.47 km/h) |
| 65 mph (104.61 km/h) | 68.97 mph (111 km/h) |
| 70 mph (112.65 km/h) | 74.28 mph (119.54 km/h) |
| 75 mph (120.7 km/h) | 79.59 mph (128.08 km/h) |
| 80 mph (128.75 km/h) | 84.89 mph (136.62 km/h) |
| 85 mph (136.79 km/h) | 90.2 mph (145.16 km/h) |
| 90 mph (144.84 km/h) | 95.5 mph (153.7 km/h) |
| 95 mph (152.89 km/h) | 100.81 mph (162.24 km/h) |
| 100 mph (160.93 km/h) | 106.11 mph (170.78 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1669 | 1939 | 2089 | 2181 | 2280 | 2351 | 2430 | 2522 | 2650 | 2778 | 2920 | 3033 | 3239 | 3467 | 3644 | 3758 | 3822 | 4056 | 4383 | 5093 |
Better Fuel Economy Factory Ratios Increased Power
