US Patent 7243925 Truck assemblies for skateboards

A skateboard truck assembly (10) having a main body (11) for mounting to the underside of a skateboard deck, an axle (24) carrying skateboard wheels (25) and mounted intermediate its opposite ends to the main body (11) via a rotatable steering adjustment body (20) for pivotal movement in a steering plane, the steering adjustment body (20) being mounted to the main body (11) for rotation about an axis extending transversely of the body (11) such that a change in the rotational position of the steering adjustment body (20) adjusts the pivot axis of the axle (24) and thus the steering characteristics of the truck assembly (10)