A handlebar is part of the steering mechanism, in lieu of a steering wheel, for vehicles that are ridden on, such as: Handlebar may also refer to ... Found on http://en.wikipedia.org/wiki/Handlebar
a lever attached, usually using an intermediary stem, to the steerer tube of the fork. Allows steering and provides a point of attachment for controls and accessories. Found on http://en.wikipedia.org/wiki/List_of_bicycle_parts