We are often asked about offset and backspace for custom wheels . How are they measured? What is the difference between them? Wheelsforless fitment experts have been answering those questions since 1991! you may finf these definitions of terms that are used to indicate various wheel measurements helpful to understand when determining correct fitment, especially on a custom application. Mounting Surface: The mounting surface of a wheel is the flat surface on the backside of the wheel that actually comes in contact with the hub or drum. Backspace: Backspace is the measurement from the mounting surface of the wheel (point the wheel actually comes in contact with the hub) to the very back edge of the wheel. Therefore the smaller the backspace measurement, the more the wheel will stick outward. Offset: Offset is the measurement from the exact center line of the wheel to the mounting surface of the wheel. Offset is negative if the mounting surface is back of the exact cen...
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