What Is a Rim Offset Chart?


Quick Answer

A rim offset chart, also known as a rim backspace chart, is a table showing the distance between the hub-mounting surface and the centerline of the rim of different wheel sizes. The offset is what locates the tire and wheel assembly in relation to the suspension.

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What Is a Rim Offset Chart?
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Full Answer

The rim offset chart helps drivers purchase a new set of wheels and avoid buying rims that may not go in line with a car model. There are three types of offset: zero, positive and negative. If the hub-mounting surface is on the brake side of the centerline of the rim, it is negative. When the hub-mounting surface is on the side that you see, it is a positive offset. Zero offset is when the hub-mounting surface is at the center of the rim. It is important to note that an extensive negative rim offset can cause increased steering wheel kickback and place additional stresses on a vehicle’s entire suspension.

A wrong rim offset on a car can make handling hard and could lead to accidents. If the chart is followed, accidents caused by a wrong offset are minimized. When getting a new set of wheels for a car, the offset should vary with the width of the set of wheel.

The chart serves as an important tool in most garages where cars receive professional care. It is important to take note of the rim offset chart when changing tires or experiencing trouble in car handling.

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