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wheel

Circular unit turning around an axle; it supports the weight of the vehicle and transmits the thrust, steering and braking actions.
wheel A part of the rim that is fixed at its center on the wheel’s axle. Metal circle constituting the wheel’s circumference and on which the tire is mounted. Edge of the rim providing lateral support to the tire bead so that it adheres solidly to it.

disk

A part of the rim that is fixed at its center on the wheel’s axle.

rim

Metal circle constituting the wheel’s circumference and on which the tire is mounted.

rim flange

Edge of the rim providing lateral support to the tire bead so that it adheres solidly to it.