Derailleur hanger

A derailleur hanger comprising:

• a first portion including an axle receiving bore configured to receive a hub axle;
• a second portion including a derailleur support surface configured to support a derailleur;
• a third portion coupled the first portion and the second portion, the third portion including a first surface facing in a first direction, a second surface facing in a second direction opposite the first direction, and a third surface facing in the first direction;
• and
• a pin including a first part coupled to the third portion, a second part projecting in the first direction from the third surface to be received in a pin receiving portion of a bicycle frame in a mounted state where the derailleur hanger is mounted to the bicycle frame, and a frangible part disposed between the first part and the second part,
• the frangible part being configured to break relative to the first part and the second part upon application of a predetermined force or higher to the pin.