Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/65-20 | 305/65-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.59 (878.5) | 35.61 (904.5) | 1.02 (26) 3% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 108.66 (2759.89) | 111.87 (2841.57) | 3.22 (81.68) 3% |
| Sidewall Height inches (mm) | 7.29 (185.25) | 7.81 (198.25) | 0.51 (13) 7% |
| Revolutions per mile (km) | 583.12 (362.33) | 566.36 (351.92) | -16.76 (-10.42) -2.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.59 mph (33.14 km/h) |
| 25 mph (40.23 km/h) | 25.74 mph (41.42 km/h) |
| 30 mph (48.28 km/h) | 30.89 mph (49.71 km/h) |
| 35 mph (56.33 km/h) | 36.04 mph (57.99 km/h) |
| 40 mph (64.37 km/h) | 41.18 mph (66.28 km/h) |
| 45 mph (72.42 km/h) | 46.33 mph (74.56 km/h) |
| 50 mph (80.47 km/h) | 51.48 mph (82.85 km/h) |
| 55 mph (88.51 km/h) | 56.63 mph (91.13 km/h) |
| 60 mph (96.56 km/h) | 61.78 mph (99.42 km/h) |
| 65 mph (104.61 km/h) | 66.92 mph (107.7 km/h) |
| 70 mph (112.65 km/h) | 72.07 mph (115.99 km/h) |
| 75 mph (120.7 km/h) | 77.22 mph (124.27 km/h) |
| 80 mph (128.75 km/h) | 82.37 mph (132.56 km/h) |
| 85 mph (136.79 km/h) | 87.52 mph (140.84 km/h) |
| 90 mph (144.84 km/h) | 92.66 mph (149.13 km/h) |
| 95 mph (152.89 km/h) | 97.81 mph (157.41 km/h) |
| 100 mph (160.93 km/h) | 102.96 mph (165.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1441 | 1674 | 1803 | 1883 | 1969 | 2030 | 2098 | 2177 | 2288 | 2398 | 2521 | 2619 | 2797 | 2993 | 3146 | 3244 | 3300 | 3502 | 3784 | 4397 |
Better Fuel Economy Factory Ratios Increased Power
