Disc sizes of Chevrolet Omega
 General parameters: Offset (ET): from 10 to 33;Drilling (PCD): -;Center hole (DIA): -.Important: wheel disc parameter PCD indicates not only the diameter of circumference of the mounting holes, but also the number of mounting bolts or nuts (for example: 5x120, where 120 (mm) is the diameter of centers of the mounting holes, and 5 is the number of mounting bolts). Possible disk sizes for Chevrolet Omega: 15x6.517x8.018x8.0 Procedure for calculating the disc offset: The distance between mating face of the wheel (the face with which the disk is pressed against the hub) and the middle of the width of disk is called disk offset (ET).The formula for calculating:ET = A - B/2, where:A is the distance between the inner plane of disk and the part in contact with the hub;B is disk width.The disk offset affects the width of the vehicle wheelbase, since the distance between the centers of symmetry (in width) of wheels on one axis directly depends on this parameter.Important: PCD of disks with four fixing bolts (or nuts) corresponds to the distance between the centers of opposite bolts (or nuts), PCD of disks with five fixing bolts (or nuts) corresponds to the distance between the centers of any non-adjacent bolts (or nuts) multiplied by the coefficient 1.051.
Wheel disks - full drawing
Possible disk parameters for Chevrolet Omega
General view
General view

Disk
Possible disk sizes for Chevrolet Omega of different years of manufacture and modifications

Wheel
Possible wheel sizes for Chevrolet Omega of different years of manufacture and modifications

ET (mm)
Disk offset

Distance between the vertical plane of symmetry of the wheel and the plane of contact of the disk to the hub.

Measured in millimeters (mm)

(General view)
15''
17''
18''
15x6.5
17x8.0
18x8.0
from 10 to 33
Table of disc sizes of Chevrolet Omega modifications
Year
Model year of manufacture

Size
Disk size in format:

1. D - diameter of the disk in inches.

2. x - a sign indicating the inseparability of the disk.

3. B - disk width in inches.

ET (mm)
Disc offset:

Distance between the vertical plane of symmetry of the wheel and the plane of contact of the disc to the hub.

PCD (mm)
Disc drilling:

1. Number of bolt holes.

2. Diameter of the circle on which the mounting holes are located.

Tire
Tire size in format:

1. Width of the work face.

2. Percentage of profile height to width.

3. R - type of construction (radial) - inner diameter (in inches).

DIA (mm)
Center hole:

Diameter of center hole, another marking is CH.

Holden Commodore 3.8L
200115x6.533x205/65R15x
200215x6.533x205/65R15x
200315x6.533x205/65R15x
200415x6.533x205/65R15x
Holden Commodore VT-SS 5.7L
199817x8.033x235/45R17x
199917x8.033x235/45R17x
200017x8.033x235/45R17x
200117x8.033x235/45R17x
Holden HSV MALOO GTS 5.7L
199618x8.010x235/40R18x
199718x8.010x235/40R18x
199818x8.010x235/40R18x
199918x8.010x235/40R18x
200018x8.010x235/40R18x
200118x8.010x235/40R18x

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