Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 385/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 39.7 (1008.5) | -6.73 (-171) -14.5% |
| Width inches (mm) | 15.55 (395) | 15.16 (385) | -0.39 (-10) -2.5% |
| Circum. inches (mm) | 145.89 (3705.51) | 124.74 (3168.3) | -21.15 (-537.21) -14.5% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 9.85 (250.25) | -3.37 (-85.5) -25.5% |
| Revolutions per mile (km) | 434.31 (269.87) | 507.95 (315.63) | 73.64 (45.76) 17% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.1 mph (27.52 km/h) |
| 25 mph (40.23 km/h) | 21.38 mph (34.4 km/h) |
| 30 mph (48.28 km/h) | 25.65 mph (41.28 km/h) |
| 35 mph (56.33 km/h) | 29.93 mph (48.16 km/h) |
| 40 mph (64.37 km/h) | 34.2 mph (55.04 km/h) |
| 45 mph (72.42 km/h) | 38.48 mph (61.92 km/h) |
| 50 mph (80.47 km/h) | 42.75 mph (68.8 km/h) |
| 55 mph (88.51 km/h) | 47.03 mph (75.68 km/h) |
| 60 mph (96.56 km/h) | 51.3 mph (82.56 km/h) |
| 65 mph (104.61 km/h) | 55.58 mph (89.44 km/h) |
| 70 mph (112.65 km/h) | 59.85 mph (96.32 km/h) |
| 75 mph (120.7 km/h) | 64.13 mph (103.2 km/h) |
| 80 mph (128.75 km/h) | 68.4 mph (110.08 km/h) |
| 85 mph (136.79 km/h) | 72.68 mph (116.96 km/h) |
| 90 mph (144.84 km/h) | 76.95 mph (123.84 km/h) |
| 95 mph (152.89 km/h) | 81.23 mph (130.72 km/h) |
| 100 mph (160.93 km/h) | 85.5 mph (137.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1293 | 1502 | 1617 | 1689 | 1766 | 1821 | 1881 | 1953 | 2052 | 2151 | 2261 | 2349 | 2508 | 2684 | 2822 | 2910 | 2959 | 3141 | 3394 | 3944 |
Better Fuel Economy Factory Ratios Increased Power
