taken directly from wikipedia for those that dont know....(for some reason chassis was one class i remembered from school)
scrub radius is the distance in front view between the Steering Axis and the center of the contact patch where both would theoretically touch the road. The steering axis is the line between the top pivot point of the hub and the lower ball joint of the hub. On a MacPherson strut, the top pivot point is the strut bearing, and the bottom point is the lower ball joint. The inclination of the steering axis is measured as the angle between the steering axis and the centerline of the wheel. This means that if your camber is adjustable within the pivot points (i.e. Volkswagen) you can change the the scrub radius, this alters the width and offset of tires you can safely run on your car.
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Ok now lets talk about Ackerman Angle YAY
