conveyance consisting of a small carrier attached to the side of a motorcycle

an add-on accessory that can be installed to carry an extra passenger

an one-wheeled vehicle attached to the side of a motorcycle, producing a three-wheeled vehicle (however, these are not called tricycles)

a three-wheel vehicle leaving two tracks with only the rear most wheel driving

structure added to a motorcycle, resting on a third wheel, for carrying passengers. Rather dangerous for the nonspecialists, this type of vehicle has considerably developed over the last few years, with articulated sidecars which lean into the bend with the motorcycle, or even single-bodied structures like the Side-Bike.

Named for its resemblance to the vehicle attached to the side of a motorcycle. A sidecar pipe has its bowl on the side of the stem, rather than in a direct line.