Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/75-20 | 285/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.83 (935.5) | 35.71 (907) | -1.12 (-28.5) -3% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 115.71 (2938.96) | 112.18 (2849.42) | -3.53 (-89.54) -3% |
| Sidewall Height inches (mm) | 8.42 (213.75) | 7.85 (199.5) | -0.56 (-14.25) -6.7% |
| Revolutions per mile (km) | 547.59 (340.26) | 564.8 (350.95) | 17.21 (10.69) 3.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.39 mph (31.21 km/h) |
| 25 mph (40.23 km/h) | 24.24 mph (39.01 km/h) |
| 30 mph (48.28 km/h) | 29.09 mph (46.81 km/h) |
| 35 mph (56.33 km/h) | 33.93 mph (54.61 km/h) |
| 40 mph (64.37 km/h) | 38.78 mph (62.41 km/h) |
| 45 mph (72.42 km/h) | 43.63 mph (70.21 km/h) |
| 50 mph (80.47 km/h) | 48.48 mph (78.02 km/h) |
| 55 mph (88.51 km/h) | 53.32 mph (85.82 km/h) |
| 60 mph (96.56 km/h) | 58.17 mph (93.62 km/h) |
| 65 mph (104.61 km/h) | 63.02 mph (101.42 km/h) |
| 70 mph (112.65 km/h) | 67.87 mph (109.22 km/h) |
| 75 mph (120.7 km/h) | 72.72 mph (117.02 km/h) |
| 80 mph (128.75 km/h) | 77.56 mph (124.83 km/h) |
| 85 mph (136.79 km/h) | 82.41 mph (132.63 km/h) |
| 90 mph (144.84 km/h) | 87.26 mph (140.43 km/h) |
| 95 mph (152.89 km/h) | 92.11 mph (148.23 km/h) |
| 100 mph (160.93 km/h) | 96.95 mph (156.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1437 | 1670 | 1798 | 1878 | 1963 | 2024 | 2092 | 2171 | 2281 | 2391 | 2514 | 2612 | 2789 | 2985 | 3138 | 3235 | 3290 | 3492 | 3774 | 4385 |
Better Fuel Economy Factory Ratios Increased Power
