See Caster, a small wheel.

Tilting of steering axis forward or backward to provide directional steering ability. Positive castor is recommended in drag racing.

Angle between an imaginary vertical line drawn through the wheel centre and a line through the kingpin or its equivalent, as seen in side elevation.

Manner in which the front wheels automatically try to straighten after the steering wheel has moved off centre. The action is promoted by the Castor Angle.

In wheel alignment, the backward or forward tilt of the steering axis. Castor is positive when the steering axis is inclined rearward at the top.

a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable

a wheel mounted with an offset steering pivot suchthat the wheel will automatically align itself to the direction in which it is pushed

A small wheel, made of wood, china, brass or leather, attached to the bottom of tables or chairs allowing them to be moved easily. Ebeniste French term for a cabinetmaker specializing in veneer.

A swivelling wheel attached to a scaffold, to contain falling debris.

the backward or forward tilt of the steering axis. Responsible for the wheels returning to straight ahead position as default

A steering wheel's tendency to return to dead center after the driver turns a corner.

A swivelling wheel secured to the bottom of a vertical member to make the scaffold mobile. The wheel is fitted with a braking device.