Tandem bicycle

A bicycle built for two or more riders seated in line, each able to pedal the shared drivetrain. Its linked pedaling lets riders combine effort while steering and balancing one vehicle.

Bicycle drivetrain: The components that transmit a rider’s pedaling force to a bicycle’s driven wheel. A tandem extends this system so multiple riders can contribute power.
Tandem cycling: The activity of riding a tandem bicycle with two or more people. It encompasses the recreational and organized uses of tandem bicycles.
Bicycle: A human-powered vehicle with two wheels arranged in tandem and driven by pedals. The tandem is a multi-rider form of the broader bicycle design.
Bicycle history: The development of bicycles, from early human-powered vehicles to modern designs. Tandems emerged within the wider evolution of bicycle technology.
Bicycle crankset: A bicycle assembly of crank arms and chainrings that converts pedaling into rotational motion. Separate cranksets let riders pedal the tandem from different seats.
Tandem bicycle racing: Competitive cycling in which teams race on tandem bicycles. Riders exploit synchronized power and aerodynamics in tandem-specific events.
Sociable: A side-by-side bicycle designed for two riders, with separate steering and pedaling positions. Unlike a tandem, a sociable places its riders beside one another.
Safety bicycle: The late nineteenth-century bicycle design with two similar-sized wheels and a chain drive to the rear wheel. Its stable frame and chain drive made practical tandem designs possible.
Bicycle chain: A linked metal chain that transfers force between bicycle sprockets. Chains connect the tandem’s cranksets to its rear wheel and synchronize pedaling.
Blind cycling: Cycling by people who are blind or have low vision, often with a sighted pilot on a tandem. A tandem lets a sighted captain steer while a blind stoker pedals.

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