This means there are six bolts arranged in a circle with a diameter of 5.5 inches or 139.7 millimeters.
It's important to note that this is the bolt pattern - the number of bolts and the circle diameter. It does not tell you the lug nut size, which is the diameter of the hole in the wheel that the lug nut goes through. To find the lug nut size, you'll need to consult your owner's manual or a reputable source like a tire shop or online parts catalog.
