Join Date: Sep 2004
Location: Dallas/Ft Worth, Texas
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The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types.
The hub mounting surface is even with the centerline of the wheel.
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 and newer rear drive cars, Ford Thunderbird for example.
The hub mounting surface is toward the back or brake side of the wheels centerline. "Deep dish" wheels are typically a negative offset.
If the offset of the wheel is not correct for the car, the handling can be adversely affected. When the width of the wheel changes, the offset also changes numerically. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. For most cars, this won't work correctly
From what ive notcied ..most bmw wheels have a 41-42 offset..if you dont wanna worry about getting a diff offset to make the wheel flush with the fender just bolt the wheels up and get the appropriate spacers to take care of it
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