All drives have a standard labeling parameters, regardless of what the drive Alloy (cast) or steel (stamped).
For example: 6.5 J May 15 ? 114.3 ET45 d54.1
6.5- The width of the disc in inches. (B)
15- Disc diameter in inches (D)
5 ? 114.3& mdash ; number of bolts (or nuts) in our case 5. diameter, on which they are located, called the PCD (Pitch Circle Diameter) and in our case it , is 114.3mm.
If you want PCD- can be calculated by measuring the distance (A) between the centers of distant holes (you can do the usual line without removing the wheel from the vehicle ):
I drive a five-bolts (or nuts) to get the value PCD, distance A should be multiplied by a factor of 1.051
PCD = Ax 1.051
I drive with the four mounting bolts (or nuts):
PCD = A
ET45- Departure (or away). This is the distance between the mating plane of the rim (the plane which is pressed against the disc to the hub) and the middle of the width of the disc. Departure (ET) is measured in mm and in our case it is equal to 45mm.
D54.1- The diameter of the central hole, which is measured by the mating plane. Diameter (DIA) measured in mm and in our case is 54.1mm.
Hump - which are small protrusions on the surface of the disk, made for tubeless tires. In turns they improve the fixation of the side tires on the drive, thereby avoiding depressurization wheel.
Many manufacturers of alloy wheels are doing DIA larger diameter, and centering on the hub using adapter rings.
