Patent ID: 11919607
Assignee: SHIMANO INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 24:
25. A bicycle rear derailleur for coaxial installation on a rear-wheel axis of a bicycle, the bicycle rear derailleur comprising:
a base element including a first attachment end being configured to be coaxially installed on the rear-wheel axis and a second attachment end for coupling to the linkage mechanism;
a movable element movably arranged relative to the base element;
a linkage mechanism connecting the movable element to the base element;
a chain guide arrangement rotatably connected to the movable element about a rotational axis; and
a fastener element configured to fix the first attachment end of the base element to a frame of the bicycle such that a fastener center axis of the fastener element and the rear-wheel axis are coaxial in a mounting state of the bicycle rear derailleur, the fastener element having a small diameter portion and a large diameter portion adjacent to the small diameter portion in an axial direction with respect to the fastener center axis;
the first attachment end having a first arm and a second arm, which are arranged so as to be spaced apart from each other in the axial direction with respect to the rear-wheel axis such that the second arm is disposed closer to an axial center plane of the bicycle than the first arm in the mounting state of the bicycle rear derailleur;
the first arm of the base element including a first attachment opening configured such that the small diameter portion of the fastener element passes through; and
the large diameter portion of the fastener element protruding from the first arm in the axial direction with respect to the rear-wheel axis in the mounting state of the bicycle rear derailleur by at least 3 mm.