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Kingpin offset/scrub radius

WARNING: This page is about a different car, the 2012 BMW 328xi, 2011 BMW 328xi, 2010 BMW 328xi, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Is the distance from the center of the wheel contact face to the intersection point of the kingpin extension. The line through the center point of the spring strut support bearing and the control arm ball joint corresponds to the "kingpin".

The scrub radius is influenced by camber, kingpin angle and wheel offset of the wheel rim.

Fig 1: Identifying Positive And Negative Kingpin Offset
G04757599Courtesy of BMW OF NORTH AMERICA, INC.
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