Electric Biker
A electric bicycle is a bicycle with an attached motor used to assist with pedaling. Generally considered as a vehicle, sometimes as a motor vehicle or a class of hybrid vehicle, electric bicycles are usually powered by electric motors or small internal combustion engines. Some can be propelled by the motor alone if the rider chooses not to pedal, while in others the motor will only run if the rider pedals.
Power applied :
the front or rear wheel may be powered via a motor built into the hub (e.g. Powabyke, Heinzmann, Crystalyte, Singer Motor Wheel)
a motor mounted in the frame or behind the rider may drive the rear wheel with a chain or rubber belt (e.g. Derny)
power may be transferred to one or other wheel from a motor mounted directly above, by bringing a powered roller into contact with the tire
the bicycle's chain may be driven by a sprocket (pedelec bikes such as the Giant LaFree)
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How to Buy Electric Bike :
Most of electric bike customers are perfectly capable of pedalling a regular bicycle. They typically buy an electric bike because they recognize it as a distinct new vehicle category, that offers most of the advantages of the pedal-only bicycle and fewer of its shortcomings.
Many electric bike customers are fit or fairly so. Fortunately, the electric bike also uniquely provides a safe, manageable and enjoyable riding experience for persons, who want to get in shape, have some injuries and disabilities or have not ridden a bicycle for years.