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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