Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 285/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 31.22 (793) | 0.82 (20.8) 2.7% |
| Width inches (mm) | 6.89 (175) | 11.22 (285) | 4.33 (110) 62.9% |
| Circum. inches (mm) | 95.51 (2425.94) | 98.08 (2491.28) | 2.57 (65.35) 2.7% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.61 (142.5) | -0.59 (-15) -9.5% |
| Revolutions per mile (km) | 663.39 (412.21) | 645.99 (401.4) | -17.4 (-10.81) -2.6% |
285/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.54 mph (33.05 km/h) |
| 25 mph (40.23 km/h) | 25.67 mph (41.32 km/h) |
| 30 mph (48.28 km/h) | 30.81 mph (49.58 km/h) |
| 35 mph (56.33 km/h) | 35.94 mph (57.84 km/h) |
| 40 mph (64.37 km/h) | 41.08 mph (66.11 km/h) |
| 45 mph (72.42 km/h) | 46.21 mph (74.37 km/h) |
| 50 mph (80.47 km/h) | 51.35 mph (82.63 km/h) |
| 55 mph (88.51 km/h) | 56.48 mph (90.9 km/h) |
| 60 mph (96.56 km/h) | 61.62 mph (99.16 km/h) |
| 65 mph (104.61 km/h) | 66.75 mph (107.43 km/h) |
| 70 mph (112.65 km/h) | 71.89 mph (115.69 km/h) |
| 75 mph (120.7 km/h) | 77.02 mph (123.95 km/h) |
| 80 mph (128.75 km/h) | 82.15 mph (132.22 km/h) |
| 85 mph (136.79 km/h) | 87.29 mph (140.48 km/h) |
| 90 mph (144.84 km/h) | 92.42 mph (148.74 km/h) |
| 95 mph (152.89 km/h) | 97.56 mph (157.01 km/h) |
| 100 mph (160.93 km/h) | 102.69 mph (165.27 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1644 | 1910 | 2057 | 2148 | 2246 | 2315 | 2392 | 2483 | 2609 | 2735 | 2875 | 2987 | 3190 | 3414 | 3589 | 3701 | 3764 | 3994 | 4316 | 5016 |
Better Fuel Economy Factory Ratios Increased Power
