Lochkreisdiameter
Lochkreisdiameter, also called bolt circle diameter, is the diameter of the circle that passes through the centers of mounting holes on a circular flange or hub. It is a fundamental parameter for mounting components such as wheels, brake discs, and flanges, because it determines whether a given part can be fastened to a hub or flange.
It is typically expressed in millimeters and is paired with the number of holes in the bolt
Common Lochkreisdiameters vary by vehicle type and region; European passenger cars often use 5x112 or 5x114.3,
Note that the center bore (the hole at the wheel’s center) is a separate requirement: it should