A Drive Shaft Replaces the Bicycle Chain

The bicycle shown above is the hybrid “Runabout” model of shaft drive, or so-called chainless, bicycles sold by Dynamic Bicycles, Holliston, Massachusetts. This company ships bicycles throughout the U. S. for a $55 flat fee.

There is some power loss due to the gears in a shaft-drive bicycle, which are less efficient than a chain. So if you are a competitive rider this bike is not for you. However, for casual riding and exercise, this type of bicycle is perfect. Moreover, it is impossible catch your pant leg in a shaft.

Shifting is incredibly easy (photo below). A segment of the right handgrip twists to change gears. No grinding of gears or jumping chains.

Below, left: The ring bevel gear on the rear wheel of a shaft-drive bicycle. Below, right: A strange-looking aftermarket Derri-Air bicycle seat that I find much more comfortable than the stock saddle.

Sources for Shaft-Driven Bicycles

Wikipedia page

Beixo, Netherlands

Dekra, California, U.S.A.

Dynacraft B.S.C., California, U.S.A.

Dynamic Bicycles, Massachsetts, U.S.A.

Oxford Chainless, Toronto, Canada

Schwinn Continental Electric, U.S.A.

Sussex Enterprises, Taiwan