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Scrub Radius

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Also, the less backspacing the more leverage the wheel and tires put on the axle hub bearings. If you can keep the center of the wheel over the center of your wheel hub, the longer your wheel bearings will last. Many newer trucks have a lot of backspacing and zero to positive offset to help their bearings last longer and to help their scrub radius as can be seen in this cutaway of the new Ford F-150.

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