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