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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. 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 ...

  5. List of bicycle types - Wikipedia

    en.wikipedia.org/wiki/List_of_bicycle_types

    Single-speed bicycles and fixed-gear bicycles have only one gear, and include all BMX bikes, many children's bikes, city messenger bikes, and many others. The fixed gear has no freewheel mechanism, so whenever the bike is in motion the pedals continue to spin. The pedals can, or sometimes must, be used to slow down.

  6. Motorcycle transmission - Wikipedia

    en.wikipedia.org/wiki/Motorcycle_transmission

    Most modern manual motorcycle gearboxes have "constant-mesh" gears which are always mated but may rotate freely on a shaft until locked by a toothed sliding collar, or "dog clutch". Since the gears are always rotating and can only be accessed sequentially, synchromesh is not generally needed. To save space, both shafts may contain a mixture of ...

  7. Bicycle gearing - Wikipedia

    en.wikipedia.org/wiki/Bicycle_gearing

    A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on the rider and the anticipated ...

  8. 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 ...

  9. Autobike - Wikipedia

    en.wikipedia.org/wiki/Autobike

    Also of note was the Trek Lime from the 2000s. It used an internal 3-speed hub gear that was electrically shifted based on the rider's speed. Power was provided by a dynamo on the front hub. [3] Current autobike designs of the 2020s build on the principles introduced by the Trek Lime.

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