Patent ID: 7963870

Claim:
A base member of a bicycle rear derailleur comprising: a housing portion with a blind bore, an inner axial end face, and an outer axial end face facing away from the inner axial end face; and a fixing bolt having a first portion rotatably supported by the housing portion within the blind bore and a second portion projecting from the housing portion, with the first portion having a radially extending flange, and the second portion having a thread formed thereon and a tool engagement structure to rotate the fixing bolt relative to the housing portion, the housing portion including a sleeve member to rotationally retain the first portion of the fixing bolt within the blind bore of the housing portion, the sleeve member having a first end face which faces the inner axial end face of the blind bore and a second end face which partially defines an abutment flange, the abutment flange having an inner axial flange face facing the inner axial end face of the blind bore and abutting the outer axial end face of the housing portion at an open end of the blind bore that is opposite the inner axial end face of the blind bore, the abutment flange limiting axial movement of the sleeve member into the blind bore so that the first end face of the sleeve member and the inner axial end face of the blind bore define a predetermined gap while the abutment flange is abutting the housing portion at the open end of the blind bore.