Caster Angle
What is Caster?
Caster refers to the angle made between the center of the lower pivot point of the axle to the center of the upper pivot point when looking from the side of the car. Caster, like Camber, has three possible states, neutral, negative and positive. Caster can be measured in degrees, but it can be referenced through other forms of measurement.
The pink arrow in the drawings below denotes the direction of travel of the car.
Neutral Caster
The image above shows a front axle which is set at an angle of 90 degrees to the ground and is therefore deemed to be in a neutral position. This is the base line measurement from which the other two caster positions are measured from.
Negative Caster
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The image above is a steering axle, but the angle has been altered into a position that is referred to a negative caster. This means the upper pivot point is in front of the lower pivot point. Negative caster is sometimes referred to as leading caster.
Positive Caster
The image above shows a steering axle in what is termed a positive caster position, where the top pivot point is further back than the lower pivot points. Positive caster is sometimes referred to as trailing caster.
Images Via RcTek