Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 425/85-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 52.44 (1332.1) | 25.05 (636.2) 91.4% |
| Width inches (mm) | 12.8 (325) | 16.73 (425) | 3.94 (100) 30.8% |
| Circum. inches (mm) | 86.07 (2186.23) | 164.76 (4184.92) | 78.69 (1998.68) 91.4% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 14.22 (361.25) | 11.02 (280) 344.6% |
| Revolutions per mile (km) | 736.13 (457.41) | 384.56 (238.95) | -351.57 (-218.45) -47.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 38.28 mph (61.61 km/h) |
| 25 mph (40.23 km/h) | 47.86 mph (77.02 km/h) |
| 30 mph (48.28 km/h) | 57.43 mph (92.42 km/h) |
| 35 mph (56.33 km/h) | 67 mph (107.82 km/h) |
| 40 mph (64.37 km/h) | 76.57 mph (123.23 km/h) |
| 45 mph (72.42 km/h) | 86.14 mph (138.63 km/h) |
| 50 mph (80.47 km/h) | 95.71 mph (154.03 km/h) |
| 55 mph (88.51 km/h) | 105.28 mph (169.43 km/h) |
| 60 mph (96.56 km/h) | 114.85 mph (184.84 km/h) |
| 65 mph (104.61 km/h) | 124.42 mph (200.24 km/h) |
| 70 mph (112.65 km/h) | 133.99 mph (215.64 km/h) |
| 75 mph (120.7 km/h) | 143.57 mph (231.05 km/h) |
| 80 mph (128.75 km/h) | 153.14 mph (246.45 km/h) |
| 85 mph (136.79 km/h) | 162.71 mph (261.85 km/h) |
| 90 mph (144.84 km/h) | 172.28 mph (277.26 km/h) |
| 95 mph (152.89 km/h) | 181.85 mph (292.66 km/h) |
| 100 mph (160.93 km/h) | 191.42 mph (308.06 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
