Page 8 - Avis mars 2021
P. 8
Offset
We seem to encounter offset more often when we're looking at wheels for late-model cars. This one's a
little trickier to measure, but it's easy to understand. Typically expressed in millimeters, offset refers to
the distance between the wheel's mounting hub and the center line of the wheel. The diagram below
will make more sense of this.
This illustration shows the cross-section of a wheel with negative, zero, and positive offsets.As you
can see, this distance can be either negative or positive. High positive offset wheels are typically found
on front-wheel-drive cars and modern rear-wheel-drive performance cars such as Corvettes, Camaros,
and Mustangs. Negative offsets yield "deep-dish" wheels commonly found on some of our favorite
older cars. So, if a wheel has an offset of 50mm, that means that the face where the wheel will bolt to
the hub is 50 millimeters to the outer, curb side from the wheel's centerline. Conversely, an offset of -
50mm is the opposite, 50 millimeters to the inside of the centerline, yielding a deeper "dish" in the
wheel.
When bolted up to your car this means that a lower offset wheel will stick out farther. If your car was
originally equipped with a +50mm offset and you replace it with a +25mm wheel, the wheel will stick
out approximately one inch farther. Obviously, a negative offset works the same way. A -25mm wheel
replaced with a -50mm wheel will move 1" outward as well.
Other Measurements
