Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 285/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 39.07 (992.5) | 8.67 (220.3) 28.5% |
| Width inches (mm) | 6.89 (175) | 11.22 (285) | 4.33 (110) 62.9% |
| Circum. inches (mm) | 95.51 (2425.94) | 122.76 (3118.03) | 27.25 (692.09) 28.5% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 9.54 (242.25) | 3.34 (84.75) 53.8% |
| Revolutions per mile (km) | 663.39 (412.21) | 516.14 (320.71) | -147.25 (-91.5) -22.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.71 mph (41.37 km/h) |
| 25 mph (40.23 km/h) | 32.13 mph (51.71 km/h) |
| 30 mph (48.28 km/h) | 38.56 mph (62.05 km/h) |
| 35 mph (56.33 km/h) | 44.99 mph (72.4 km/h) |
| 40 mph (64.37 km/h) | 51.41 mph (82.74 km/h) |
| 45 mph (72.42 km/h) | 57.84 mph (93.08 km/h) |
| 50 mph (80.47 km/h) | 64.26 mph (103.42 km/h) |
| 55 mph (88.51 km/h) | 70.69 mph (113.77 km/h) |
| 60 mph (96.56 km/h) | 77.12 mph (124.11 km/h) |
| 65 mph (104.61 km/h) | 83.54 mph (134.45 km/h) |
| 70 mph (112.65 km/h) | 89.97 mph (144.79 km/h) |
| 75 mph (120.7 km/h) | 96.4 mph (155.14 km/h) |
| 80 mph (128.75 km/h) | 102.82 mph (165.48 km/h) |
| 85 mph (136.79 km/h) | 109.25 mph (175.82 km/h) |
| 90 mph (144.84 km/h) | 115.68 mph (186.16 km/h) |
| 95 mph (152.89 km/h) | 122.1 mph (196.51 km/h) |
| 100 mph (160.93 km/h) | 128.53 mph (206.85 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1313 | 1526 | 1643 | 1716 | 1794 | 1850 | 1912 | 1984 | 2085 | 2185 | 2297 | 2387 | 2549 | 2728 | 2867 | 2957 | 3007 | 3191 | 3449 | 4008 |
Better Fuel Economy Factory Ratios Increased Power
