Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 285/85-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 36.07 (916.3) | -10.36 (-263.2) -22.3% |
| Width inches (mm) | 15.55 (395) | 11.22 (285) | -4.33 (-110) -27.8% |
| Circum. inches (mm) | 145.89 (3705.51) | 113.33 (2878.64) | -32.55 (-826.87) -22.3% |
| 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) | 559.06 (347.39) | 124.75 (77.52) 28.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 15.54 mph (25 km/h) |
| 25 mph (40.23 km/h) | 19.42 mph (31.26 km/h) |
| 30 mph (48.28 km/h) | 23.31 mph (37.51 km/h) |
| 35 mph (56.33 km/h) | 27.19 mph (43.76 km/h) |
| 40 mph (64.37 km/h) | 31.07 mph (50.01 km/h) |
| 45 mph (72.42 km/h) | 34.96 mph (56.26 km/h) |
| 50 mph (80.47 km/h) | 38.84 mph (62.51 km/h) |
| 55 mph (88.51 km/h) | 42.73 mph (68.76 km/h) |
| 60 mph (96.56 km/h) | 46.61 mph (75.01 km/h) |
| 65 mph (104.61 km/h) | 50.5 mph (81.26 km/h) |
| 70 mph (112.65 km/h) | 54.38 mph (87.52 km/h) |
| 75 mph (120.7 km/h) | 58.26 mph (93.77 km/h) |
| 80 mph (128.75 km/h) | 62.15 mph (100.02 km/h) |
| 85 mph (136.79 km/h) | 66.03 mph (106.27 km/h) |
| 90 mph (144.84 km/h) | 69.92 mph (112.52 km/h) |
| 95 mph (152.89 km/h) | 73.8 mph (118.77 km/h) |
| 100 mph (160.93 km/h) | 77.69 mph (125.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1423 | 1653 | 1780 | 1859 | 1943 | 2004 | 2070 | 2149 | 2258 | 2367 | 2488 | 2585 | 2761 | 2954 | 3106 | 3203 | 3257 | 3457 | 3735 | 4341 |
Better Fuel Economy Factory Ratios Increased Power
