# Disc sizes of GMC Sierra 1500 Limited

The number of disk modifications for the Sierra 1500 Limited is: 5 (pcs).

### General parameters:

• Offset (ET): from 24 (mm) to 31 (mm);
• Drilling (PCD): 6x139.7 (mm);
• Center hole (DIA): 78.1 (mm).

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 GMC model:

• Wheel disks 17x7.5: D 17'' (43.2), B 7.5'' (19.1);
• Wheel disks 17x8.0: D 17'' (43.2), B 8.0'' (20.3);
• Wheel disks 18x8.5: D 18'' (45.7), B 8.5'' (21.6);
• Wheel disks 20x9.0: D 20'' (50.8), B 9.0'' (22.9);
• Wheel disks 22x9.0: D 22'' (55.9), B 9.0'' (22.9).

### 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.

General view wheel disks

# Other parameters GMC Sierra 1500 Limited:

Possible disk parameters for GMC Sierra 1500 Limited
General view

(General view)
17x7.5
17x8.0
18x8.5
20x9.0
22x9.0
17''
18''
20''
22''
from 24 (mm) to 31 (mm)
Table of disc sizes of GMC Sierra 1500 Limited modifications
5.3i
201917x7.5316x139.7255/70R1778.1
201917x8.0246x139.7265/70R1778.1
201918x8.5246x139.7265/65R1878.1
201920x9.0276x139.7275/55R2078.1
201922x9.0246x139.7285/45R2278.1

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.