The wheel offset on GMC vehicles is the distance from the centerline of the wheel to the mounting face of the wheel. It has a direct effect on the steering and handling characteristics of your car. A wheel with too much or too little offset will make your car feel "nervous" or "sluggish" and may cause issues in braking and steering.
Aside from GMC wheel offset, there is also the backspacing you must take into account. It is the distance from the mounting face of the wheel to the back edge of the wheel. Backspacing has a direct effect on wheel clearance and tire-to-fender fitment.
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