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Backspace is the distance from the
mounting surface of the wheel and the back edge of the
wheel. (Mounting surface is the surface of the wheel that
touches the hub of the vehicle.) Backspace is
always expressed in inches. The smaller the backspace
is the deeper the wheel lip will be which means the wheel
will stick out more on the vehicle. A wheel with
larger backspace will be flush and may have no lip at all
like those on front wheel drive cars.
Below is a diagram showing how to measure
backspace on a front wheel drive wheel which has a large
backspace.
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