Roller racer
Encyclopedia
A Roller Racer is a human powered vehicle and children's toy.
The vehicle consists of a plastic seat with wheels on its bottom, attached to T style handlebars by a pin joint. The handlebars also have wheels, attached to what would be the vertical portion of the "T". In the 1980s the Roller Racer was sold under the WHAM-O
Wham-O
Wham-O Inc. is a toy company currently located in California, USA. They are known for marketing many popular toys in the past 50 years, including the Hula Hoop, the Frisbee, Slip 'N Slide, Super Ball, Trac-Ball, Silly String, Hacky Sack and the Boogie board....

 brand name, but is now sold by the Mason Corporation.

The method of propulsion is peculiar to this and the PlasmaCar
PlasmaCar
The PlasmaCar is a plastic ride-on toy car designed for children, made popular by Canadian toy distributor PlaSmart. The PlasmaCar can be propelled by wiggling the front steering wheel which is attached to two pivoting wheels touching the ground. It harnesses the natural forces of inertia,...

. The user moves (forward only) by oscillating the handlebars. Propulsion is difficult during turns, so they can be made only while coasting.

Further reading

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