Abstract: A field serviceable device in conjunction with a pivoting means and a stationary means, such as a bicycle derailleur and a derailleur hanger, respectively. The device comprises a head, a barrel, a flange, and a pin. The barrel comprises a barrel-flange connector and barrel-pin connector on a first end, and a barrel-head connector on a second end. The head, flange, and pin are independently connected to the barrel. The pin has a pin-tool opening extending through the pin, and the barrel has a barrel-tool opening of sufficient dimension extending through the barrel such that a pin tool can extend into the barrel-tool opening without interference. The pin further defines a pin fracture notch that is designed to fracture before the pivoting means or stationary means is damaged due to a force applied to the pivoting means or stationary means by debris impacting the pivoting or stationary means or becoming wedged between, for example, the bicycle frame and the derailleur.

Abstract: A device designed to replace the existing mounting bolt and snap-ring on most derailleurs. A head and barrel are connected to retain the spring and tension adjusting components of the derailleur and to serve as a receptacle for a pin. The pin attaches directly to the derailleur hanger of the bicycle and is designed to withstand normal pedaling forces, while assuring separation prior to excessive yielding of the derailleur. The pin is manufactured with an opening so that a tool can be inserted in it to easily remove the separated pieces. As a result, damage to the frame and derailleur is prevented and the bicycle can be easily repaired by replacement of the pin.