Patent ID: 7614972

Claim:
A bicycle base member adjustment assembly for a base member of a rear derailleur, the bicycle base member adjustment assembly comprising: a base member stopper plate including an annular part with a mounting opening, an adjustment tab extending from the annular part in a first axial direction with respect to a center axis of the mounting opening, a frame contacting tab extending from the annular part in a second axial direction that is opposite to the first axial direction for contacting a bicycle frame to limit movement of the base member stopper plate relative to the bicycle frame when the bicycle base member adjustment assembly is mounted between the rear derailleur and the bicycle frame, and a stopper tab extending from the annular part in the first axial direction with respect to the center axis of the mounting opening to limit movement of the base member of the rear derailleur relative to the base member stopper plate when the bicycle base member adjustment assembly is mounted between the rear derailleur and the bicycle frame; a biasing force adjustment member including an annular part with a mounting opening, an abutment surface that faces in a circumferential direction with respect to a center axis of the mounting opening of the biasing force adjustment member and an engagement part configured to engage a biasing element of the base member of the rear derailleur, the biasing force adjustment member being rotatably disposed with respect to the base member stopper plate; and a bolt disposed in a threaded aperture of the adjustment tab with a free end of the bolt contacting the abutment surface of the biasing force adjustment member to selectively set a relative angular position of the biasing force adjustment member relative to the base member stopper plate about the center axis of the mounting opening of the base member.