What is Castor in steering geometry?

The caster angle or castor angle is the angular displacement of the steering axis from the vertical axis of a steered wheel in a car, motorcycle, bicycle, other vehicle or a vessel, as seen from the side of the vehicle.

How does Castor affect steering?

Caster angle settings allow the vehicle manufacturer to balance steering effort, high speed stability and front end cornering effectiveness. Increasing the amount of positive caster will increase steering effort and straight line tracking, as well as improve high speed stability and cornering effectiveness.

What will too much caster do?

Caster settings are not a primary, direct factor in tire wear. However, excessive positive caster in association with other alignment maladjustments can exacerbate a tire wear issue. For example, a tire wear pattern called feathering can result from a combination of too much caster with incorrect toe settings.

What is castor alignment?

What is Caster? Caster is the angle that identifies the forward or backward slope of a line that is drawn through the upper and lower steering pivot points. It does not affect tire wear, but caster does have an influence on the directional control of the steering.

How does negative caster affect handling?

Negative caster results in lighter and easier steering but reduced stability when driving in a straight line. Vehicles with negative caster do not handle as well. What is this? A symptom of negative caster is a sloppy or loose-feeling steering wheel (which is lot less common than a hard to turn wheel).

What will be effect of unequal Castor in the vehicle?

So: Camber and caster will cause your vehicle to pull if they’re uneven, but will cause little tire wear, while toe in won’t cause your vehicle to pull, but can cause extremely fast tire wear.

What does too much castor do?

If you have too much positive caster, you can induce a tire shake/shimmy. Also as an important note here…. underinflated front tires can also induce a tire shake/shimmy too. The amount of caster directly correlates to the length of caster trail in a given suspension.

How do I adjust my steering caster?

One way to adjust caster is with an adjustable arm. In the case of a MacPherson strut system this can be in the form of an adjustable tension rod that holds the lower arm forwards or backwards in the wheel arch. The screw can be adjusted to move the wheel forwards or backwards adjusting the caster angle.

What is positive caster good for?

Positive caster is primarily beneficial to the vehicle as it increases the lean of the tire when the vehicle is cornering, while returning it to an upright position when driving straight ahead. Negative Caster – If the line slopes towards the front of the vehicle then the caster is negative.