Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 285/90-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 40.2 (1021) | 9.8 (248.8) 32.2% |
| Width inches (mm) | 6.89 (175) | 11.22 (285) | 4.33 (110) 62.9% |
| Circum. inches (mm) | 95.51 (2425.94) | 126.28 (3207.57) | 30.77 (781.63) 32.2% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 10.1 (256.5) | 3.9 (99) 62.9% |
| Revolutions per mile (km) | 663.39 (412.21) | 501.73 (311.76) | -161.66 (-100.45) -24.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.44 mph (42.56 km/h) |
| 25 mph (40.23 km/h) | 33.05 mph (53.2 km/h) |
| 30 mph (48.28 km/h) | 39.67 mph (63.84 km/h) |
| 35 mph (56.33 km/h) | 46.28 mph (74.48 km/h) |
| 40 mph (64.37 km/h) | 52.89 mph (85.11 km/h) |
| 45 mph (72.42 km/h) | 59.5 mph (95.75 km/h) |
| 50 mph (80.47 km/h) | 66.11 mph (106.39 km/h) |
| 55 mph (88.51 km/h) | 72.72 mph (117.03 km/h) |
| 60 mph (96.56 km/h) | 79.33 mph (127.67 km/h) |
| 65 mph (104.61 km/h) | 85.94 mph (138.31 km/h) |
| 70 mph (112.65 km/h) | 92.55 mph (148.95 km/h) |
| 75 mph (120.7 km/h) | 99.16 mph (159.59 km/h) |
| 80 mph (128.75 km/h) | 105.78 mph (170.23 km/h) |
| 85 mph (136.79 km/h) | 112.39 mph (180.87 km/h) |
| 90 mph (144.84 km/h) | 119 mph (191.51 km/h) |
| 95 mph (152.89 km/h) | 125.61 mph (202.15 km/h) |
| 100 mph (160.93 km/h) | 132.22 mph (212.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1277 | 1483 | 1597 | 1668 | 1744 | 1798 | 1858 | 1929 | 2027 | 2124 | 2233 | 2320 | 2478 | 2651 | 2787 | 2874 | 2923 | 3102 | 3352 | 3896 |
Better Fuel Economy Factory Ratios Increased Power
