A transmission having a hollow-cylindrical main body having end faces, which has internal toothing and a rotation axis and in which a driven input member and an output member are rotatably mounted, wherein the output member comprises two rotating bodies, which are non-rotatably connected to one another and have a circular cross-section transversely to the rotation axis. The rotating bodies are provided with spacers, a gear wheel and a device for converting planetary movements of the gear wheel into rotational movements of the output member being disposed between the rotating bodies. The device has a ring shape, the two end faces of which have two guides with central axes, one of whose end face extend perpendicularly to an axial plane of the transmission, while the other end face extend parallel to the axial plane, and the ring has continuous, axially oriented openings through which spacers pass without contact.