Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 380/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 42.44 (1078) | -4 (-101.5) -8.6% |
| Width inches (mm) | 15.55 (395) | 14.96 (380) | -0.59 (-15) -3.8% |
| Circum. inches (mm) | 145.89 (3705.51) | 133.33 (3386.64) | -12.55 (-318.87) -8.6% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 11.22 (285) | -2 (-50.75) -15.1% |
| Revolutions per mile (km) | 434.31 (269.87) | 475.2 (295.28) | 40.89 (25.41) 9.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.28 mph (29.42 km/h) |
| 25 mph (40.23 km/h) | 22.85 mph (36.77 km/h) |
| 30 mph (48.28 km/h) | 27.42 mph (44.13 km/h) |
| 35 mph (56.33 km/h) | 31.99 mph (51.48 km/h) |
| 40 mph (64.37 km/h) | 36.56 mph (58.83 km/h) |
| 45 mph (72.42 km/h) | 41.13 mph (66.19 km/h) |
| 50 mph (80.47 km/h) | 45.7 mph (73.54 km/h) |
| 55 mph (88.51 km/h) | 50.27 mph (80.9 km/h) |
| 60 mph (96.56 km/h) | 54.84 mph (88.25 km/h) |
| 65 mph (104.61 km/h) | 59.41 mph (95.61 km/h) |
| 70 mph (112.65 km/h) | 63.98 mph (102.96 km/h) |
| 75 mph (120.7 km/h) | 68.55 mph (110.31 km/h) |
| 80 mph (128.75 km/h) | 73.12 mph (117.67 km/h) |
| 85 mph (136.79 km/h) | 77.69 mph (125.02 km/h) |
| 90 mph (144.84 km/h) | 82.26 mph (132.38 km/h) |
| 95 mph (152.89 km/h) | 86.82 mph (139.73 km/h) |
| 100 mph (160.93 km/h) | 91.39 mph (147.09 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1209 | 1405 | 1513 | 1580 | 1652 | 1703 | 1760 | 1827 | 1919 | 2012 | 2115 | 2197 | 2347 | 2511 | 2640 | 2722 | 2769 | 2938 | 3175 | 3690 |
Better Fuel Economy Factory Ratios Increased Power
