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  2. Shaft-driven bicycle - Wikipedia

    en.wikipedia.org/wiki/Shaft-driven_bicycle

    In 1902, The Hill-Climber Bicycle Mfg. Company sold a three-speed shaft-driven bicycle in which the shifting was implemented with three sets of bevel gears. [7] While a small number of chainless bicycles were available, for the most part, shaft-driven bicycles disappeared from view for most of the 20th century.

  3. Freewheel - Wikipedia

    en.wikipedia.org/wiki/Freewheel

    Citroën combined a freewheel and a centrifugal clutch to make the so-called 'TraffiClutch', which let the driver start, stop, and change the lower gears without using the clutch. This was an option on Citroën 2CVs and its derivatives and, as the name implied, was marketed as a benefit for driving in congested urban areas.

  4. Derailleur - Wikipedia

    en.wikipedia.org/wiki/Derailleur

    Shimano 600 front derailleur (1980). A derailleur (French pronunciation:) is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another.

  5. Fixed-gear bicycle - Wikipedia

    en.wikipedia.org/wiki/Fixed-gear_bicycle

    A track bicycle or track bike is a form of fixed-gear bicycle optimized for racing at a velodrome or at an outdoor track. Some road racing and club cyclists use a fixed-gear bicycle for training during the winter months, generally using a relatively low gear ratio, believed to help develop a good pedalling style. [5]

  6. Chainless bicycle - Wikipedia

    en.wikipedia.org/wiki/Chainless_bicycle

    Hildick's chainless bicycle gear (1898) A chainless bicycle is a bicycle that transmits power to the driven wheel ... Directly driven bicycle (see penny-farthing and ...

  7. Single-speed bicycle - Wikipedia

    en.wikipedia.org/wiki/Single-speed_bicycle

    These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. There are many types of modern single speed bicycles; BMX bicycles, most bicycles designed for children, cruiser type bicycles , classic commuter bicycles , unicycles , bicycles designed for track racing , fixed-gear road ...

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