GMC Wheel Offset Chart
A GMC wheel offset chart helps owners and tire buyers see how the mounting surface of a wheel relates to the centerline of the rim. Offset affects whether the tire and rim sit inward toward the suspension or outward toward the fender. Because this dimension interacts with rim width, rim diameter, bolt pattern, clearance, and tire compatibility, using the wrong offset can change steering feel, rub suspension parts, or alter the look of the truck or SUV. The chart is a reference, not a universal rule, since different GMC models, years, and suspension packages can shift the acceptable range.
Essential answer
The essential answer is that a GMC wheel offset chart is a reference for comparing the factory-designed offset range against aftermarket wheel choices. Offset is usually stated in millimeters and can be positive, zero, or negative. A wheel with positive offset has its mounting face toward the outside of the rim centerline, which is common on many modern GMC trucks and SUVs because it keeps the tire package tucked closer to the suspension and steering geometry.
Offset only becomes useful when read with rim width because the same offset number on a wider rim moves the outer edge farther outward. A chart or guide may group acceptable fitments by model platform, but it cannot guarantee clearance for modified suspension, larger tires, or aftermarket brakes. The important practical point is to treat listed offset as a starting range and then check how rim diameter, width, and tire section width combine to affect inner suspension clearance and outer fender clearance.