Abstract: A single, manually operated lever rotates cam means providing guide surfaces that program a progressive series of different drive ratio combinations of the front and rear sprockets of a conventional 10-speed bicycle. The gearshift is mounted on and projecting forwardly from the bicycle's handlebar next to the handlebar stem. The lever has a limited range of movement in a fore and aft direction and can be placed in any one of six drive ratio positions. The lowest and highest drive ratio combinations of the front and rear sprockets are obtained automatically when the lever is placed in its rearwardmost and forwardmost positions, respectively, and intermediate drive ratios are obtained in consecutive increments ordered from the lowest to the highest drive ratio positions of the lever. The guide surfaces have cooperating cam followers to which the control cables for the front and rear derailleurs are attached.