BICYCLE TRANSMISSION

Disclosed is a bicycle transmission comprising: a support housing coupled to a hub spindle unit to which wheels of the bicycle are coupled; a sprocket support unit rotatably installed on the circumference of the support housing for supporting a plurality of sprockets at the outside; a latch unit installed between the support housing and the sprocket support unit for restricting a free rotation of the sprocket support unit in one direction and making a free rotation in the other direction possible; and a latch control unit for making the free rotation of the sprocket support unit even in one direction with respect to the support housing possible by selectively controlling the latch unit to make it possible to shift gears in a stopped state, wherein the latch unit comprises: a latch interference member coupled to en end of the support housing and having a latch interference part formed with regular valleys and ridges in a circumferential direction along the circumference; a latch support cap coupled to the sprocket support unit to position the latch interference on an inner circumference side; and a latch having the center rotatably installed on the inside of the latch support cap, coming any one end in contact with the latch interference member according to a rotation position, restricting the free rotation of the sprocket support unit toward the contacted side and making the free rotation toward an opposite direction possible.