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Caster (axle inclination)
Caster is the forward or backward inclination of the kingpin.
The purpose is to make the wheels strive to point straight ahead. That makes the driving out of a
curve easier, especially at high speed, thus reducing the strain on the steering assembly.
The greater the caster, the greater the tendency of the wheels to point straight ahead.
Nevertheless, turning the steering wheel outward from the center position is more difficult. On the other hand, the smaller the caster, the harder to turn the wheels away from the center position,
besides a greater risk of vibration. This way, choosing the caster is a matter of weighing the most favorable relationship between advantages and disadvantages. If the kingpin is inclined as seen
in the illustration, the caster is called positive.
A = Caster
B = Chassis angle
V = Vertical line
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