This disclosure relates to a device for changing a gear of a bicycle. The device can include a casing, a lever moveable relative to the casing for actuating a gear change of a bicycle, and a rail arranged on the casing, wherein the rail extends between a first end and a second end. The lever can be configured to move along a length direction of the rail, which extends between the first end and the second end of the rail, for actuating the gear change of the bicycle. The rail can extend about a width direction and project from the casing about a height direction. The casing can include a flange located at the second end of the rail, and the flange can be configured for inhibiting the lever to continue moving beyond the second end of the rail in a direction which extends away from both the first end and the second end of the rail. The flange can at least partially span a width of the rail.