Wheel offset
The wheel's offset is the distance from its hub mounting surface to the
centerline of the wheel. To determine wheel offset:
- Position the wheel on a flat surface and measure its overall width.
- Divide the overall width by two, then subtract this result from the backspace value.
Offset = Backspace - (Wheel Width / 2)
The offset of a wheel can be one of the following three settings:
Zero offset:
The hub mounting surface is even with the centerline of the wheel.
Positive offset:
The hub mounting surface is toward the front or wheel side of the wheel.
Positive offset wheels are generally found on front-wheel drive cars.
Negative offset:
The hub mounting surface is toward the back or brake side of the wheel's
centerline. "Deep dish" wheels are typically negative offset.
Pitch Circle Diameter (PCD):
To calculate a 5 stud PCD = Length 'X' x 1.7012
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