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Can someone explain what the offset of a wheel is? I've been looking at 16x7.5 wheels recently and I plan on throwing on some wheel spacers to really line the wheels up with the body. But how do I know what size offset I have or should have? I have searched the site and found some good threads but I'm still kinda confused on the actual technical stuff of what the offset actually is??? Thanks guys.
 

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From http://www.tirerack.com/wheels/tech/offset.htm

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.

Zero Offset
The hub mounting surface is even with the centerline of the wheel.

Positive
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.

Negative
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. We have test fitted thousands of different vehicles for proper fitment. Our extensive database allows our sales staff to offer you the perfect fit for your vehicle.
 

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your best bet... is getting a wheel with a 35 offset if you have any type of drop you wont have to worry about rubbing... best tire size for your mk3 would also be like a 205/40/16 or a 195/40/16
 

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By the look of the picture I don't know how they would reduce it, but they can do alot these days..
 
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