A bicycle rear derailleur is configured to be mounted to a bracket device formed separately from the bicycle rear derailleur. The bicycle rear derailleur includes a base element, a movable element, a linkage mechanism, and a chain guide. The base element includes a first base end and a second base end. The movable element is movably arranged relative to the base element. The linkage mechanism connects the movable element to the base element. The chain guide arrangement is rotatably connected to the movable element about a rotational axis. The second base end is coupled to the linkage mechanism. The first base end includes a first base arm and a second base arm. The first base end and the second base end are configured such that the derailleur attachment end is disposed between the first base arm and the second base arm in the mounting state.

A bicycle rear derailleur is configured to be mounted to a bracket device formed separately from the bicycle rear derailleur. The bicycle rear derailleur includes a base element, a movable element, a linkage mechanism, and a chain guide. The base element includes a first base end and a second base end. The movable element is movably arranged relative to the base element. The linkage mechanism connects the movable element to the base element. The chain guide arrangement is rotatably connected to the movable element about a rotational axis. The second base end is coupled to the linkage mechanism. The first base end includes a first base arm and a second base arm. The first base end and the second base end are configured such that the derailleur attachment end is disposed between the first base arm and the second base arm in the mounting state.

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism.

A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism.

A derailleur basically includes a base member, a movable member and a linkage assembly. The base member includes a first base member connecting section and a second base member connecting section. The movable member includes a first movable member connecting section and a second movable member connecting section. The linkage assembly includes an inner link member and an outer link member. The outer link is pivotally coupled to the second base member connecting section about a third pivot axis. The outer link is pivotally coupled to the second movable member connecting section about a fourth pivot axis. The outer link member has a power source receiving part that is configured to be arranged such that the power source receiving part traverses a reference line extending between the third pivot axis and the fourth pivot axis.

A derailleur basically includes a base member, a movable member and a linkage assembly. The base member includes a first base member connecting section and a second base member connecting section. The movable member includes a first movable member connecting section and a second movable member connecting section. The linkage assembly includes an inner link member and an outer link member. The outer link is pivotally coupled to the second base member connecting section about a third pivot axis. The outer link is pivotally coupled to the second movable member connecting section about a fourth pivot axis. The outer link member has a power source receiving part that is configured to be arranged such that the power source receiving part traverses a reference line extending between the third pivot axis and the fourth pivot axis.

A bicycle rear derailleur includes a base component, a movable component, a linkage assembly, a chain guide, a driving assembly and a clutch mechanism. The linkage assembly includes a first link and a second link. Two opposite sides of the first link are connected to the base component and the movable component via a first shaft and a second shaft. Two opposite sides of the second link are connected to the base component and the movable component via a third shaft and a fourth shaft. The chain guide is disposed on the movable component. The driving assembly is disposed on the first link and configured to drive the first shaft. The clutch mechanism is movably disposed at a position where the first shaft is connected to the base component. The clutch mechanism is configured to connect or disconnect a transmission relationship between the first shaft and the base component.

A bicycle rear derailleur includes a base component, a movable component, a linkage assembly, a chain guide, a driving assembly and a clutch mechanism. The linkage assembly includes a first link and a second link. Two opposite sides of the first link are connected to the base component and the movable component via a first shaft and a second shaft. Two opposite sides of the second link are connected to the base component and the movable component via a third shaft and a fourth shaft. The chain guide is disposed on the movable component. The driving assembly is disposed on the first link and configured to drive the first shaft. The clutch mechanism is movably disposed at a position where the first shaft is connected to the base component. The clutch mechanism is configured to connect or disconnect a transmission relationship between the first shaft and the base component.

A bicycle rear derailleur is provided, including a mounting portion; a linkage mechanism, pivoted to the mounting portion and having an extension portion having a cable fixing point and being located at an inner position relative to an outer side of the linkage mechanism; a guiding mechanism, pivoted to the linkage mechanism and being rotatable about an axis, the guiding mechanism including a first pulley defining a pulley plane and a second pulley, an extension line which is perpendicular to the axis and an axial extension line of the second pulley being defined as a first reference line; wherein when the bicycle rear derailleur is located on an initial position, the cable fixing point is between the first reference line and the mounting portion, and the cable fixing point dose not cross the pulley plane during gearshift of the bicycle rear derailleur relative to rear sprockets.

A bicycle rear derailleur is provided, including a mounting portion; a linkage mechanism, pivoted to the mounting portion and having an extension portion having a cable fixing point and being located at an inner position relative to an outer side of the linkage mechanism; a guiding mechanism, pivoted to the linkage mechanism and being rotatable about an axis, the guiding mechanism including a first pulley defining a pulley plane and a second pulley, an extension line which is perpendicular to the axis and an axial extension line of the second pulley being defined as a first reference line; wherein when the bicycle rear derailleur is located on an initial position, the cable fixing point is between the first reference line and the mounting portion, and the cable fixing point dose not cross the pulley plane during gearshift of the bicycle rear derailleur relative to rear sprockets.