|Front Side and
Back Side Settings
Front side is the distance from the front edge of the wheel back
to where it contacts the hub (or drum). Back side or backspace is the
distance from the back edge of the wheel in to where the wheel
contacts the hub (or drum). These two dimensions added together
will be approximately 1" wider than the designated wheel width.
Wheel width is measured at the tire bead seat and does not
include the flanges where balance weights clip on.
Figuring the Offsets
The best way to figure out what front and back side settings to
order for your car, is to follow these steps:
A straight edge on the brake/hub face can
also be used to measure clearances in the wheel house to give
approximate front and back side dimensions. Don't forget tire
bulge and tire-to-fender clearance. Contact Mustang Depot if you
have further questions – 702-262-0011.
- Install a mock up wheel and tire
on the vehicle.
- Analyze and measure how much you
would like the tire to move out or back on the front side of
the tire and write down the dimension.
- Measure how much you would like to
change the backside of the tire position. Write down that
- Remove the wheel and tire from the
- Measure the front side setting of
the mock up and add it to the change you earlier recorded.
- Measure the back side setting (rim
edge) of the mock up and add or subtract that dimension to
the change you wanted. These final dimensions will tell you
what front side and back side settings you will want on your
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