handle bar riser

A bicycle handlebar is the steering control for bicycles. It is the equivalent of a steering wheel for vehicles and vessels, but is most often directly mechanically linked to a pivoting front wheel via a stem which in turn attaches it to the fork. Besides steering, handlebars also often support a portion of the rider's weight, depending on their riding position, and provide a convenient mounting place for brake levers, shift levers, cyclocomputers, bells, etc.

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