Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 425/85-21 | 425/80-25 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 49.44 (1255.9) | 51.77 (1315) | 2.33 (59.1) 4.7% |
| Width inches (mm) | 16.73 (425) | 16.73 (425) | 0 (0) 0% |
| Circum. inches (mm) | 155.34 (3945.53) | 162.65 (4131.19) | 7.31 (185.67) 4.7% |
| Sidewall Height inches (mm) | 14.22 (361.25) | 13.39 (340) | -0.84 (-21.25) -5.9% |
| Revolutions per mile (km) | 407.89 (253.45) | 389.56 (242.06) | -18.33 (-11.39) -4.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.94 mph (33.7 km/h) |
| 25 mph (40.23 km/h) | 26.18 mph (42.13 km/h) |
| 30 mph (48.28 km/h) | 31.41 mph (50.55 km/h) |
| 35 mph (56.33 km/h) | 36.65 mph (58.98 km/h) |
| 40 mph (64.37 km/h) | 41.88 mph (67.4 km/h) |
| 45 mph (72.42 km/h) | 47.12 mph (75.83 km/h) |
| 50 mph (80.47 km/h) | 52.35 mph (84.25 km/h) |
| 55 mph (88.51 km/h) | 57.59 mph (92.68 km/h) |
| 60 mph (96.56 km/h) | 62.82 mph (101.1 km/h) |
| 65 mph (104.61 km/h) | 68.06 mph (109.53 km/h) |
| 70 mph (112.65 km/h) | 73.29 mph (117.96 km/h) |
| 75 mph (120.7 km/h) | 78.53 mph (126.38 km/h) |
| 80 mph (128.75 km/h) | 83.76 mph (134.81 km/h) |
| 85 mph (136.79 km/h) | 89 mph (143.23 km/h) |
| 90 mph (144.84 km/h) | 94.24 mph (151.66 km/h) |
| 95 mph (152.89 km/h) | 99.47 mph (160.08 km/h) |
| 100 mph (160.93 km/h) | 104.71 mph (168.51 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
