Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 425/25-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 32.37 (822.1) | 4.97 (126.2) 18.1% |
| Width inches (mm) | 12.8 (325) | 16.73 (425) | 3.94 (100) 30.8% |
| Circum. inches (mm) | 86.07 (2186.23) | 101.68 (2582.7) | 15.61 (396.47) 18.1% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 4.18 (106.25) | 0.98 (25) 30.8% |
| Revolutions per mile (km) | 736.13 (457.41) | 623.12 (387.19) | -113 (-70.22) -15.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.63 mph (38.02 km/h) |
| 25 mph (40.23 km/h) | 29.53 mph (47.53 km/h) |
| 30 mph (48.28 km/h) | 35.44 mph (57.04 km/h) |
| 35 mph (56.33 km/h) | 41.35 mph (66.54 km/h) |
| 40 mph (64.37 km/h) | 47.25 mph (76.05 km/h) |
| 45 mph (72.42 km/h) | 53.16 mph (85.55 km/h) |
| 50 mph (80.47 km/h) | 59.07 mph (95.06 km/h) |
| 55 mph (88.51 km/h) | 64.97 mph (104.57 km/h) |
| 60 mph (96.56 km/h) | 70.88 mph (114.07 km/h) |
| 65 mph (104.61 km/h) | 76.79 mph (123.58 km/h) |
| 70 mph (112.65 km/h) | 82.69 mph (133.08 km/h) |
| 75 mph (120.7 km/h) | 88.6 mph (142.59 km/h) |
| 80 mph (128.75 km/h) | 94.51 mph (152.1 km/h) |
| 85 mph (136.79 km/h) | 100.41 mph (161.6 km/h) |
| 90 mph (144.84 km/h) | 106.32 mph (171.11 km/h) |
| 95 mph (152.89 km/h) | 112.23 mph (180.61 km/h) |
| 100 mph (160.93 km/h) | 118.13 mph (190.12 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1586 | 1842 | 1984 | 2072 | 2166 | 2234 | 2308 | 2395 | 2517 | 2638 | 2773 | 2881 | 3077 | 3293 | 3462 | 3570 | 3630 | 3853 | 4163 | 4838 |
Better Fuel Economy Factory Ratios Increased Power
