Sivuvaunu

Sivuvaunu, Finnish for sidecar, is an auxiliary vehicle mounted to the side of a motorcycle to carry a passenger or cargo. It comprises a bodied compartment, its own wheel and suspension, and a mounting arm that connects to the motorcycle frame. Sidecars can be attached permanently or as detachable units. They are usually mounted on one side of the motorcycle, depending on local regulations and configurations.

Design and handling: The sidecar has its own wheel and suspension; it does not steer, so steering remains the responsibility of the motorcycle rider. The added mass and altered weight distribution affect handling, braking, and cornering. Sidecars can alter throttle response, require different riding technique, and may introduce a tendency toward pulling to the side or push-through during turns. Some models include a dedicated brake on the sidecar wheel.

History and use: Sidecars were developed in the late 19th and early 20th centuries and became widespread in the interwar years. They were used for civilian transport, touring, cargo, and for military purposes, including reconnaissance and courier duties. After World War II, production declined in some markets but persisted among enthusiasts and specialized applications.

Modern practice: Today, sidecars are produced by specialist manufacturers and as aftermarket fittings. They range from basic open variants to aerodynamically shaped, weatherproof models. They remain popular for long-distance touring, cargo transport, and in regions with limited public transport. Safety considerations include appropriate licensing, load limits, and training in sidecar riding techniques.