The trucks of a skateboard are metal axle assemblies, mounted to the underneath of the deck.

Spindles are the innermost part of the trailer wheel and axle assembly.

A single tie rod connects the left and right axle assemblies.

The overall rear axle assembly seems to have been unusually simple, but the resulting stresses gave rise to a shortened axle life.

The switch activated a vacuum-activated spline clutch that was built into the front axle assembly.

The device allowed the front axle assembly to pivot in the horizontal plane, to facilitate turning.

Cabs and axle assemblies are produced at its Westerlo plant in Belgium.

His design ran along a track in an axle assembly, known as a ball race, thus originating the modern ball bearing design.

The cone brakes, contained within the rear axle assembly or truck, can be attached to the rear of any skateboard deck.

Spindles are a critical part of the axle assembly.