Kingpin inclination is the angle (2) produced between the
steering axis centre line (1) and a vertical line (4) to the road,
transverse to the axis of symmetry.
The kingpin inclination is positive (normal situation) if the
steering axis centre line is set inwards towards the top of the
vertical line.
The positive kingpin inclination supports the return of the
wheels to the straight ahead position after cornering, and prevents
wheel "wobble".
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