Caster is the inclination of the front
knuckle. Positive caster (the rearward tilt of the top of the knuckle)
is essential for high-speed stability. While greater caster angles serve
to improve straight-line stability, they also cause an increase in steering
effort. Three to five degrees of positive caster is the typical range of
settings, with lower angles being used on heavier vehicles to keep the
steering effort reasonable. 40, 55, and 60 Series Landcruisers had approximately
1 of positive caster.
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