What is "skatecycle"

The Skatecycle, also known as the "Freerider Skatecycle", is the world's first mass-produced hubless, self-propelled skate. Invented and patented by Alon Karpman, the Skatecycle was manufactured by Brooklyn Workshop, Inc. based at that time in Red Hook, Brooklyn. Unlike most traditional skateboards, the user does not need to continuously push off the ground to gain and maintain speed. The Skatecycle marks the first time a hub-less machine has been mass-produced, and it is now part of the permanent collection at the Henry Ford Museum and the Bicycle Museum of America.