In conclusion, some common practical advice.
Discs suffer greatly from abrasive, atmospheric influences and aggressive chemicals that are sprinkled on the street. It is recommended at least once a year to thoroughly clean the wheels, preferably previously removed, control their anti-corrosion coating (and aluminum wheels are protected by an anti-corrosion coating), and in case of damage to the coloring, its restoration. The integrity of the edges of the rim is very important. Deformed edges can damage tires.
Corroded discs have reduced strength and, consequently, load capacity, which reduces driving safety. If the disc is damaged from a side impact and has runout, it must be replaced immediately.
A large layer of dirt, dried on the inner surfaces of the disk, contributes to the imbalance of the wheels with all the ensuing consequences.
Disc sizes
6 (or 6) = rim width in inches.
J = rim flange edge shape.
14 (or 15) = rim diameter in inches.
HZ (ET) = dimension from the bearing position of the disc to the plane passing through the axis of the rim.
The diameter of the pitch circle of five holes for the bolts of an automobile wheel is 100 mm.