Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 380/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 43.94 (1116) | -2.5 (-63.5) -5.4% |
| Width inches (mm) | 15.55 (395) | 14.96 (380) | -0.59 (-15) -3.8% |
| Circum. inches (mm) | 145.89 (3705.51) | 138.03 (3506.02) | -7.85 (-199.49) -5.4% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 11.97 (304) | -1.25 (-31.75) -9.5% |
| Revolutions per mile (km) | 434.31 (269.87) | 459.02 (285.22) | 24.71 (15.36) 5.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.92 mph (30.45 km/h) |
| 25 mph (40.23 km/h) | 23.65 mph (38.07 km/h) |
| 30 mph (48.28 km/h) | 28.38 mph (45.68 km/h) |
| 35 mph (56.33 km/h) | 33.12 mph (53.29 km/h) |
| 40 mph (64.37 km/h) | 37.85 mph (60.91 km/h) |
| 45 mph (72.42 km/h) | 42.58 mph (68.52 km/h) |
| 50 mph (80.47 km/h) | 47.31 mph (76.14 km/h) |
| 55 mph (88.51 km/h) | 52.04 mph (83.75 km/h) |
| 60 mph (96.56 km/h) | 56.77 mph (91.36 km/h) |
| 65 mph (104.61 km/h) | 61.5 mph (98.98 km/h) |
| 70 mph (112.65 km/h) | 66.23 mph (106.59 km/h) |
| 75 mph (120.7 km/h) | 70.96 mph (114.2 km/h) |
| 80 mph (128.75 km/h) | 75.69 mph (121.82 km/h) |
| 85 mph (136.79 km/h) | 80.42 mph (129.43 km/h) |
| 90 mph (144.84 km/h) | 85.15 mph (137.04 km/h) |
| 95 mph (152.89 km/h) | 89.89 mph (144.66 km/h) |
| 100 mph (160.93 km/h) | 94.62 mph (152.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1168 | 1357 | 1461 | 1526 | 1596 | 1645 | 1700 | 1765 | 1854 | 1944 | 2043 | 2123 | 2267 | 2426 | 2550 | 2630 | 2674 | 2838 | 3067 | 3564 |
Better Fuel Economy Factory Ratios Increased Power
