A balance bicycle or run bike is a training bicycle that helps children learn balance and steering. It has no pedals and no drivetrain.
The first balance bicycle was the dandy horse, and was invented by Karl Drais, the earliest form of a two-wheeler - without pedals. His first reported ride from Mannheim to Rheinau (now a section of Mannheim) took place on June 12, 1817. Drais was a German inventor and invented the Laufmaschine ("running machine"), also later called the velocipede, draisine (English) or "draisienne" (French), or nicknamed, dandy horse. This incorporated the two-wheeler principle that is basic to the bicycle and motorcycle and meant the beginning of mechanized personal transport.
Balance bikes have been made out of both metal and wood. It can be a normal bicycle with pedals and related parts removed, or it can be purpose-built (especially for very small children, for whom normal bicycles are generally not available). It can have no brake, or it can have one or two hand-activated rim brakes.
To function properly, a balance bicycle must be small enough that the rider can walk the bicycle while sitting comfortably in the saddle, putting both feet flat on the ground. The rider first walks the bicycle while standing over the saddle, then while sitting in the saddle. Eventually, the rider feels comfortable enough to run and "scoot" while riding the bicycle, then to lift both feet off the ground and cruise while balancing on the two wheels.