Also known as Scrub Radius.
The distance from the point where the steering axis intersects the ground to the longitudinal line that runs through the centre of the tyre's contact patch. Positive scrub radius is when the tyre contact patch is outside of the steering axis pivot, whilst negative scrub radius is when the contact patch is inboard of the steering axis pivot. Front wheel drive vehicles usually have zero or negative scrub radius, whilst rear wheel drive vehicles generally have a positive scrub radius.
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