Bicycle derailleur motor unit assembly

A bicycle front derailleur motor unit assembly comprising:

• a motorized front derailleur mounting member configured to be mounted to a bicycle frame, the motorized front derailleur mounting member including a front derailleur mounting portion and a motor unit mounting portion, the front derailleur mounting portion being configured to be coupled to a linkage of a front derailleur;
• and
• a motor unit including a motor unit housing configured to be removably coupled to the motor unit mounting portion and an output shaft configured and arranged to rotate about a rotation axis relative to the motor unit housing in a first rotational direction and a second rotational direction that is opposite the first rotational direction;
• the motor unit mounting portion including a first fastener-less mating structure and the motor unit housing including a second fastener-less mating structure removably coupled to the first fastener-less mating structure,
• the first and second fastener-less mating structures being configured and arranged to resist rotational movement of the motor unit housing about the rotational axis of the output shaft relative to the motorized front derailleur mounting member due to a torque produced by rotation of the output shaft relative to the motor unit housing.