Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 330/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 40.79 (1036) | -5.65 (-143.5) -12.2% |
| Width inches (mm) | 15.55 (395) | 12.99 (330) | -2.56 (-65) -16.5% |
| Circum. inches (mm) | 145.89 (3705.51) | 128.14 (3254.69) | -17.75 (-450.82) -12.2% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 10.39 (264) | -2.82 (-71.75) -21.4% |
| Revolutions per mile (km) | 434.31 (269.87) | 494.47 (307.25) | 60.16 (37.38) 13.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.57 mph (28.27 km/h) |
| 25 mph (40.23 km/h) | 21.96 mph (35.34 km/h) |
| 30 mph (48.28 km/h) | 26.35 mph (42.41 km/h) |
| 35 mph (56.33 km/h) | 30.74 mph (49.47 km/h) |
| 40 mph (64.37 km/h) | 35.13 mph (56.54 km/h) |
| 45 mph (72.42 km/h) | 39.53 mph (63.61 km/h) |
| 50 mph (80.47 km/h) | 43.92 mph (70.68 km/h) |
| 55 mph (88.51 km/h) | 48.31 mph (77.75 km/h) |
| 60 mph (96.56 km/h) | 52.7 mph (84.81 km/h) |
| 65 mph (104.61 km/h) | 57.09 mph (91.88 km/h) |
| 70 mph (112.65 km/h) | 61.48 mph (98.95 km/h) |
| 75 mph (120.7 km/h) | 65.88 mph (106.02 km/h) |
| 80 mph (128.75 km/h) | 70.27 mph (113.08 km/h) |
| 85 mph (136.79 km/h) | 74.66 mph (120.15 km/h) |
| 90 mph (144.84 km/h) | 79.05 mph (127.22 km/h) |
| 95 mph (152.89 km/h) | 83.44 mph (134.29 km/h) |
| 100 mph (160.93 km/h) | 87.83 mph (141.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1258 | 1462 | 1574 | 1644 | 1719 | 1772 | 1831 | 1901 | 1997 | 2094 | 2201 | 2286 | 2442 | 2613 | 2747 | 2833 | 2881 | 3057 | 3304 | 3839 |
Better Fuel Economy Factory Ratios Increased Power
