Caster (Front wheels)
is the forward or backward angle of an imaginary line drawn through the upper and lower pivot points. This determines how well your steering wheel returns to its position after turning.

Steering Axis Inclination (Front wheels)
is the angle from which the spindle support centre line is tilted from true vertical. This provides directional control stability and assists with vehicle load placement.

Thrust Angle (Rear wheels)
is the angle the rear wheels are positioned at in relation to the vehicle's centre line. Causes the vehicle to pull to one side, crabbing, steering wheel misalignment and excessive tyre wear.