Definitions for "Caster Angle"
Keywords:  steered, tire, ahead, tilt, backward
A steering geometry term; see diagram here. Caster is impacted the greatest when lifting a vehicle that has radius arms.
The angle which a kingpin makes with a vertical line, as viewed from the side. A positive caster angle tends to keep wheels in a straight line. Proper caster adjustments improve both tire wear and fuel.
Angle in side elevation of the forward or backward tilt of the steering axis. If the point of load is ahead of the point of contact, the caster angle is positive. The caster angle tends to keep wheels in a straight line and proper adjustment improves both tire wear and fuel economy.