Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 425/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 48.44 (1230.5) | 21.05 (534.6) 76.8% |
| Width inches (mm) | 12.8 (325) | 16.73 (425) | 3.94 (100) 30.8% |
| Circum. inches (mm) | 86.07 (2186.23) | 152.19 (3865.73) | 66.12 (1679.5) 76.8% |
| 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) | 416.31 (258.68) | -319.82 (-198.72) -43.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 35.36 mph (56.91 km/h) |
| 25 mph (40.23 km/h) | 44.21 mph (71.14 km/h) |
| 30 mph (48.28 km/h) | 53.05 mph (85.37 km/h) |
| 35 mph (56.33 km/h) | 61.89 mph (99.6 km/h) |
| 40 mph (64.37 km/h) | 70.73 mph (113.83 km/h) |
| 45 mph (72.42 km/h) | 79.57 mph (128.06 km/h) |
| 50 mph (80.47 km/h) | 88.41 mph (142.28 km/h) |
| 55 mph (88.51 km/h) | 97.25 mph (156.51 km/h) |
| 60 mph (96.56 km/h) | 106.09 mph (170.74 km/h) |
| 65 mph (104.61 km/h) | 114.93 mph (184.97 km/h) |
| 70 mph (112.65 km/h) | 123.77 mph (199.2 km/h) |
| 75 mph (120.7 km/h) | 132.62 mph (213.43 km/h) |
| 80 mph (128.75 km/h) | 141.46 mph (227.65 km/h) |
| 85 mph (136.79 km/h) | 150.3 mph (241.88 km/h) |
| 90 mph (144.84 km/h) | 159.14 mph (256.11 km/h) |
| 95 mph (152.89 km/h) | 167.98 mph (270.34 km/h) |
| 100 mph (160.93 km/h) | 176.82 mph (284.57 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
