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Whizzer bicycle engines are a line of bicycle engines that were produced in the United States from 1939 to 1965. They were commonly sold as kits to be assembled and attached to a consumer's bicycle thus creating a motorized bicycle. Whizzer U.S.A. re-appeared in 1997 to sell an improved version, pre-assembled on an old Schwinn-style bicycle frame.
Patents for electric bicycles with hub motors were granted as early as 1895. [4] Bicycle hub motors are simple, durable, and affordable compared to other designs, but less suitable for high speeds. [5] Hub motors rose in popularity over other designs in the late 2000s and 2010s. [6]
A motorized bicycle is a bicycle with an attached motor or engine and transmission used either to power the vehicle unassisted, or to assist with pedalling. Since it sometimes retains both pedals and a discrete connected drive for rider-powered propulsion, the motorized bicycle is in technical terms a true bicycle, albeit a power-assisted one.
Previously, bicycles had been used as "commercial vehicles, either in a tricycle configuration or as modified touring tricycles." In the late 1940s, a "Pixie" bicycle motor was installed to assist with heavy loads and climbing hills. One Ottawa greengrocer was seen using one of these delivery bikes from the 1930s until the early 1960s.
Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios .
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