Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-20 | 285/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.22 (793) | 30.1 (764.5) | -1.12 (-28.5) -3.6% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 98.08 (2491.28) | 94.56 (2401.75) | -3.53 (-89.54) -3.6% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 5.05 (128.25) | -0.56 (-14.25) -10% |
| Revolutions per mile (km) | 645.99 (401.4) | 670.07 (416.36) | 24.08 (14.96) 3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.28 mph (31.03 km/h) |
| 25 mph (40.23 km/h) | 24.1 mph (38.79 km/h) |
| 30 mph (48.28 km/h) | 28.92 mph (46.55 km/h) |
| 35 mph (56.33 km/h) | 33.74 mph (54.3 km/h) |
| 40 mph (64.37 km/h) | 38.56 mph (62.06 km/h) |
| 45 mph (72.42 km/h) | 43.38 mph (69.82 km/h) |
| 50 mph (80.47 km/h) | 48.2 mph (77.58 km/h) |
| 55 mph (88.51 km/h) | 53.02 mph (85.33 km/h) |
| 60 mph (96.56 km/h) | 57.84 mph (93.09 km/h) |
| 65 mph (104.61 km/h) | 62.66 mph (100.85 km/h) |
| 70 mph (112.65 km/h) | 67.48 mph (108.61 km/h) |
| 75 mph (120.7 km/h) | 72.3 mph (116.36 km/h) |
| 80 mph (128.75 km/h) | 77.12 mph (124.12 km/h) |
| 85 mph (136.79 km/h) | 81.95 mph (131.88 km/h) |
| 90 mph (144.84 km/h) | 86.77 mph (139.64 km/h) |
| 95 mph (152.89 km/h) | 91.59 mph (147.39 km/h) |
| 100 mph (160.93 km/h) | 96.41 mph (155.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1705 | 1981 | 2133 | 2228 | 2329 | 2402 | 2482 | 2576 | 2707 | 2837 | 2982 | 3098 | 3309 | 3541 | 3722 | 3839 | 3904 | 4143 | 4477 | 5203 |
Better Fuel Economy Factory Ratios Increased Power
