Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 285/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 39.07 (992.5) | -7.36 (-187) -15.9% |
| Width inches (mm) | 15.55 (395) | 11.22 (285) | -4.33 (-110) -27.8% |
| Circum. inches (mm) | 145.89 (3705.51) | 122.76 (3118.03) | -23.13 (-587.48) -15.9% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 9.54 (242.25) | -3.68 (-93.5) -27.8% |
| Revolutions per mile (km) | 434.31 (269.87) | 516.14 (320.71) | 81.83 (50.85) 18.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.83 mph (27.08 km/h) |
| 25 mph (40.23 km/h) | 21.04 mph (33.85 km/h) |
| 30 mph (48.28 km/h) | 25.24 mph (40.63 km/h) |
| 35 mph (56.33 km/h) | 29.45 mph (47.4 km/h) |
| 40 mph (64.37 km/h) | 33.66 mph (54.17 km/h) |
| 45 mph (72.42 km/h) | 37.87 mph (60.94 km/h) |
| 50 mph (80.47 km/h) | 42.07 mph (67.71 km/h) |
| 55 mph (88.51 km/h) | 46.28 mph (74.48 km/h) |
| 60 mph (96.56 km/h) | 50.49 mph (81.25 km/h) |
| 65 mph (104.61 km/h) | 54.69 mph (88.02 km/h) |
| 70 mph (112.65 km/h) | 58.9 mph (94.79 km/h) |
| 75 mph (120.7 km/h) | 63.11 mph (101.56 km/h) |
| 80 mph (128.75 km/h) | 67.32 mph (108.34 km/h) |
| 85 mph (136.79 km/h) | 71.52 mph (115.11 km/h) |
| 90 mph (144.84 km/h) | 75.73 mph (121.88 km/h) |
| 95 mph (152.89 km/h) | 79.94 mph (128.65 km/h) |
| 100 mph (160.93 km/h) | 84.15 mph (135.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1313 | 1526 | 1643 | 1716 | 1794 | 1850 | 1912 | 1984 | 2085 | 2185 | 2297 | 2387 | 2549 | 2728 | 2867 | 2957 | 3007 | 3191 | 3449 | 4008 |
Better Fuel Economy Factory Ratios Increased Power
