How wheel offset changes fitment
Wheel offset is the distance between the wheel centerline and the hub mounting face. Positive offset moves the wheel farther inward. Lower offset generally moves it toward the fender. Width matters at the same time: a wider wheel can move both its inner and outer edges even when the offset stays unchanged.
Inner clearance and outer poke
Inner clearance measures how the new wheel barrel moves relative to the suspension. A positive inward change means the barrel sits closer to struts or control arms. Outer poke measures movement toward the fender. Check both values because changing width and offset can improve one side while reducing space on the other.
Inner position = wheel width in mm ÷ 2 + offset
Outer position = wheel width in mm ÷ 2 − offset
Wheel offset vs. backspacing
Offset uses millimeters from the wheel centerline. Backspacing measures from the hub face to the rear wheel edge, usually in inches. The calculator estimates backspacing by adding one inch to nominal wheel width for both rim flanges. Actual wheels vary, so confirm manufacturer dimensions before ordering.