Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/80-16 | 445/80-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.47 (926.4) | 49.03 (1245.4) | 12.56 (319) 34.4% |
| Width inches (mm) | 12.8 (325) | 17.52 (445) | 4.72 (120) 36.9% |
| Circum. inches (mm) | 114.58 (2910.37) | 154.04 (3912.54) | 39.46 (1002.17) 34.4% |
| Sidewall Height inches (mm) | 10.24 (260) | 14.02 (356) | 3.78 (96) 36.9% |
| Revolutions per mile (km) | 552.97 (343.6) | 411.33 (255.59) | -141.64 (-88.01) -25.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.89 mph (43.27 km/h) |
| 25 mph (40.23 km/h) | 33.61 mph (54.09 km/h) |
| 30 mph (48.28 km/h) | 40.33 mph (64.91 km/h) |
| 35 mph (56.33 km/h) | 47.05 mph (75.72 km/h) |
| 40 mph (64.37 km/h) | 53.77 mph (86.54 km/h) |
| 45 mph (72.42 km/h) | 60.5 mph (97.36 km/h) |
| 50 mph (80.47 km/h) | 67.22 mph (108.18 km/h) |
| 55 mph (88.51 km/h) | 73.94 mph (118.99 km/h) |
| 60 mph (96.56 km/h) | 80.66 mph (129.81 km/h) |
| 65 mph (104.61 km/h) | 87.38 mph (140.63 km/h) |
| 70 mph (112.65 km/h) | 94.1 mph (151.45 km/h) |
| 75 mph (120.7 km/h) | 100.83 mph (162.26 km/h) |
| 80 mph (128.75 km/h) | 107.55 mph (173.08 km/h) |
| 85 mph (136.79 km/h) | 114.27 mph (183.9 km/h) |
| 90 mph (144.84 km/h) | 120.99 mph (194.72 km/h) |
| 95 mph (152.89 km/h) | 127.71 mph (205.53 km/h) |
| 100 mph (160.93 km/h) | 134.43 mph (216.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
