In the side view the kingpin inclination is called Caster angle. If the kingpin axis
doesn’t pass through the centre of the wheel then there is a side view Kingpin offset
present. The distance from the kingpin axis to the centre of the tire print on the ground
is called Trail or Caster offset. See Figure 2.2 for the side view geometry. The caster
angle and trail is of importance when designing the suspension geometry. The effects
considered in this work are