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General parameters: 
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: 

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 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 nonadjacent bolts (or nuts) multiplied by the coefficient 1.051. 
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 
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  
2001  15x6.5  33  x  205/65R15  x 
2002  15x6.5  33  x  205/65R15  x 
2003  15x6.5  33  x  205/65R15  x 
2004  15x6.5  33  x  205/65R15  x 
Holden Commodore VTSS 5.7L  
1998  17x8.0  33  x  235/45R17  x 
1999  17x8.0  33  x  235/45R17  x 
2000  17x8.0  33  x  235/45R17  x 
2001  17x8.0  33  x  235/45R17  x 
Holden HSV MALOO GTS 5.7L  
1996  18x8.0  10  x  235/40R18  x 
1997  18x8.0  10  x  235/40R18  x 
1998  18x8.0  10  x  235/40R18  x 
1999  18x8.0  10  x  235/40R18  x 
2000  18x8.0  10  x  235/40R18  x 
2001  18x8.0  10  x  235/40R18  x 