Disc sizes of GMC Syclone
The number of disk modifications for the Syclone is: 2 (pcs).
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The number of disk modifications for the Syclone is: 2 (pcs).
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).
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 nonadjacent bolts (or nuts) multiplied by the coefficient 1.051.
General view wheel disks 


Possible disk parameters for GMC Syclone  

General view General view wheel disks  Wheel disks Possible disk sizes for GMC Syclone of different years of manufacture and modifications 
Wheels Possible wheel sizes for GMC Syclone 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) 
16x8.0 17x8.5 
16'' 17'' 
from 41 (mm) to 45 (mm) 
Table of disc sizes of GMC Syclone modifications  

Year Model year of manufacture 
Dimensions 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. 
Tires 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. 
4.3T GMT300  
1992  16x8.0  41  5x120.65  245/50R16  70.3 
1992  17x8.5  45  5x120.65  255/45R17  70.3 
1991  16x8.0  41  5x120.65  245/50R16  70.3 
1991  17x8.5  45  5x120.65  255/45R17  70.3 
Warning: despite the fact that the data are official figures of manufacturers, the above information is for reference only and does not guarantee unambiguous accuracy.