A hydraulic one-finger two-way acting gear shift operator (1) for a handlebar comprising a housing (2) with first and second cylinder chambers (3, 4),- a first and a second piston (31, 41) with first and second piston rods (32, 42) arranged in the first and second cylinder chambers (3,4), - a first and a second lever (39, 49) arranged to independently push the first and second piston rods (32, 42) and corresponding pistons (31, 41) longitudinally inside the first and second cylinder chambers (3, 4), wherein the first and second levers (39, 49) are connected to the housing (2) in first and second pivot points (38, 48), respectively.
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