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Offset is the distance from the
mounting surface of the wheel (surface of the wheel that
touches the hub of the vehicle) to the center line of the
wheel. There are three types of offset.
Zero offset means that the mounting
surface of the wheel is in the exact center of the wheel.
Positive offset means the mounting
surface of the wheel is toward the front side of the wheel
from the center of the wheel. Positive offset is
expressed in millimeters with a plus sign. (i.e. +35mm).
This example means the mounting surface is toward the front
side of the wheel 35mm from the center line of the wheel.
Negative offset means the mounting
surface of the wheel is toward the back side of the wheel
from the center of the wheel. Negative offset
expressed in millimeters with a negative sign. (i.e.
-12mm). This example means the mounting surface is
toward the back side of the wheel 12mm from the center line
of the wheel.
Below is a diagram showing a wheel with
Positive offset.
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