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​The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. Offset is usually stamped or engraved into the wheel and is measured in millimeters of “ET” (ET is the short form of the German word 'Einpresstiefe' which literally translates as 'insertion depth). Offset affects performance, ride quality, the look of your vehicle and more important than anything, how safe the setup is.  The basics: The offset can be one of three types.

​“0 Offset”: The hub mounting surface is even with the centerline of the wheel.

“+ 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 and newer rear drive cars.

“- Offset”:  The hub mounting surface is toward the back or brake side of the wheels centerline. “Deep dish” wheels are typically a negative offset.

A car's wheel offset is specifically designed by the engineers who developed the car to work with the type of car it is, the kind of performance it delivers and the way it is intended to be driven. If the wrong offset wheel is used, a car's handling can be adversely affected. The wrong offset wheel can also put undue stress on wheel bearings. Suspension components will also experience more stress, occasionally causing them to break. This is most likely to happen when a positive offset wheel is replaced by a wheel with a strong offset that moves the wheel further outward from the suspension than it should be.