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  2. Penny-farthing - Wikipedia

    en.wikipedia.org/wiki/Penny-farthing

    The penny-farthing, also known as a high wheel, high wheeler or ordinary, is an early type of bicycle. [1] It was popular in the 1870s and 1880s, with its large front wheel providing high speeds, owing to it travelling a large distance for every rotation of the wheel.

  3. Electric bicycle - Wikipedia

    en.wikipedia.org/wiki/Electric_bicycle

    The propulsion is provided at the pedals rather than at the wheel, being eventually applied to the wheel via the bicycle's standard drive train. Freewheel crank , that is a freewheel in the bottom bracket, is a necessary part in mid-drive systems to allow the electric motor to work inside its optimal rotational speed range ( r/min ).