The Sachs/SRAM Automatic 2 speed hub is not a kickback (to shift) hub like the Sturmey S2C, S2, the Sachs Duomatic or the Bendix kickback 2 speed hubs (which require a backward motion of the crank to shift) .. the Sachs/SRAM Automatic hubs shift by centrifugal force .. the wheel rpm gets to a certain speed and then it shifts, automatically, up or down (depending on wheel speed rotation)..