Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/75-20 | 305/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.83 (935.5) | 38.01 (965.5) | 1.18 (30) 3.2% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 115.71 (2938.96) | 119.42 (3033.21) | 3.71 (94.25) 3.2% |
| Sidewall Height inches (mm) | 8.42 (213.75) | 9.01 (228.75) | 0.59 (15) 7% |
| Revolutions per mile (km) | 547.59 (340.26) | 530.57 (329.68) | -17.01 (-10.57) -3.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.64 mph (33.22 km/h) |
| 25 mph (40.23 km/h) | 25.8 mph (41.52 km/h) |
| 30 mph (48.28 km/h) | 30.96 mph (49.83 km/h) |
| 35 mph (56.33 km/h) | 36.12 mph (58.13 km/h) |
| 40 mph (64.37 km/h) | 41.28 mph (66.44 km/h) |
| 45 mph (72.42 km/h) | 46.44 mph (74.74 km/h) |
| 50 mph (80.47 km/h) | 51.6 mph (83.05 km/h) |
| 55 mph (88.51 km/h) | 56.76 mph (91.35 km/h) |
| 60 mph (96.56 km/h) | 61.92 mph (99.66 km/h) |
| 65 mph (104.61 km/h) | 67.08 mph (107.96 km/h) |
| 70 mph (112.65 km/h) | 72.24 mph (116.27 km/h) |
| 75 mph (120.7 km/h) | 77.41 mph (124.57 km/h) |
| 80 mph (128.75 km/h) | 82.57 mph (132.88 km/h) |
| 85 mph (136.79 km/h) | 87.73 mph (141.18 km/h) |
| 90 mph (144.84 km/h) | 92.89 mph (149.49 km/h) |
| 95 mph (152.89 km/h) | 98.05 mph (157.79 km/h) |
| 100 mph (160.93 km/h) | 103.21 mph (166.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1350 | 1569 | 1689 | 1764 | 1844 | 1902 | 1965 | 2040 | 2143 | 2247 | 2361 | 2453 | 2620 | 2804 | 2947 | 3039 | 3091 | 3281 | 3545 | 4120 |
Better Fuel Economy Factory Ratios Increased Power
