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2. Motorized bicycle - Wikipedia

   en.wikipedia.org/wiki/Motorized_bicycle

   A motorized bicycle is a bicycle with an 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.

3. Whizzer (motorcycles) - Wikipedia

   en.wikipedia.org/wiki/Whizzer_(motorcycles)

   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.

4. Electric bicycle - Wikipedia

   en.wikipedia.org/wiki/Electric_bicycle

   An electric bicycle, e-bike, electrically assisted pedal cycle, or electrically power assisted cycle [1] is a motorized bicycle with an integrated electric motor used to assist propulsion.

5. Derny - Wikipedia

   en.wikipedia.org/wiki/Derny

   A Derny is a motorized bicycle for motor-paced cycling events such as during six-day and Keirin racing and motor-paced road races. Some riders train behind a derny on the road. The Derny is so-called as it was originally produced by the French Derny firm, but the name Derny is now applied to all small cycle-pacing vehicles, regardless of ...

6. NSU Motorenwerke - Wikipedia

   en.wikipedia.org/wiki/NSU_Motorenwerke

   NSU is primarily remembered today as the first licensee and one of only four automobile companies to produce cars for sale with rotary-piston "Wankel engines". NSU invented the principle of the modern Wankel engine with an inner rotor. The NSU Ro 80 was the second mass-produced two-rotor Wankel-powered vehicle after the Mazda Cosmo.

7. VéloSoleX - Wikipedia

   en.wikipedia.org/wiki/VéloSoleX

   The company manufactured centrifugal radiators, carburetors, and micrometers, before branching into assist motors and bicycles. The moped originally created during World War II and mass-produced between 1946 and 1988 came in various iterations, whilst keeping the same concept of a motor with roller resting on the front wheel of a bicycle.