Wheel offset is simply the distance between the wheel's hub-mounting surface and its center plane. Positive offset means the hub-mounting surface is closer to the wheel's outboard side. Conversely, negative offset means it's closer to the inboard side. If the mounting surface coincides with the wheel's center plane then offset measures in at zero. In other words, offset determines the lateral, or side to side, position of the wheel. As wheel widths change, the offset combined with the new width must be chosen properly so that the wheel and tire have enough space within the wheelwell to avoid rubbing or unwanted contact with other components.
The ability to understand wheel offset can help solve a variety of wheel fitment issues. Wheel and tire upsizing often requires altered offsets. If the offset of the wheel is not correct for the car, the handling can be adversely affected.
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