Balance bicycle
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A balance bicycle (balance bike, run bike) is a training bicycle that helps the rider learn balance and steering. It has no pedals, no crankset and chain, and no training wheels. 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.
Children as young as 18 months can learn to cruise a balance bicycle within a few hours' practice.[citation needed]
With a balance bicycle, the rider learns balance first, pedal last. In contrast, with a normal bicycle fitted with training wheels, the rider learns pedal first, balance last. Although opinions differ regarding which learning sequence is easier for most riders[citation needed], it is generally agreed that a bicycle with pedals is too difficult for most very young children[citation needed] and that training wheels may encourage the rider to learn some behaviors which later must be unlearned.[citation needed]