Abstract: A top/bottom pull front derailleur includes a base member, inner and outer links, a chain guide and a top/low adjustment mechanism coupled to the base member. The links are pivotally coupled between the base member and the chain guide. The inner link has a wire fixing part that can be used in top and bottom pull arrangements. The chain guide is configured to move between a retracted position and an extended position relative to the base member. The adjustment mechanism includes top and low adjusting bolts with longitudinal bolt axes angled more than zero degrees relative to a plane of the bicycle frame. The adjustment mechanism is mounted rearwardly of single attachment portion of the outer link or between a pair of attachment portions of the outer link. The bolt axes are preferably angled about 45 degrees or about 90 degrees relative to the plane of the frame.

Abstract: A motorized bicycle derailleur assembly has a motor unit, a movable part (e.g., a motor linkage, a derailleur linkage and/or a chain guide) and a controller. The movable part is in response to activation of the motor unit within a mechanical stroke. The motor unit has a motor output stroke with a prescribed maximum movement range that is larger than the mechanical stroke of the movable part. The movable part has an anti-jamming arrangement having an anti-jamming spring. The anti-jamming spring is configured and arranged to compress when the motor unit continues to apply a moving force to the movable part after the movable part reaches a lockup position. The controller is configured to set the motor unit output stroke to an operating movement range that is smaller than the prescribed maximum movement range so that the anti-jamming biasing element remains uncompressed during normal shifting operation.

Abstract: A front derailleur is configured to be accurately mounted to a bicycle frame in a prescribed mounting position. The front derailleur has a chain guide, a front derailleur main body, an intermediate piece and a fastening piece. The front derailleur main body has a mounting part with a curved mounting face having a circular arc arranged around a first pivot axis extending in a first direction. The intermediate piece has a first curved abutting face mating with the curved mounting face of the mounting part to pivot relative to each other about the first pivot axis, a second curved abutting face having a circular arc arranged around a second pivot axis extending in a second direction perpendicularly arranged relative to the first direction, and a first through hole extending in a third direction generally perpendicular to the first and second directions and passes through the first and second abutting faces.

Abstract: A bicycle front derailleur includes a base member, a movable member and a linkage assembly. The base member is configured to be fixedly coupled to a bicycle frame. The movable member has a chain guide portion. The linkage assembly is coupled between the base member and the movable member to move the chain guide portion between a retracted position and an extended position. The chain guide portion includes a chain guide element defining a chain path and a movable plate arranged to pivot about a pivot axis relative to the chain guide element in a see-saw movement.

Abstract: A main derailleur body includes a first end and a second end. The first end of the main derailleur body is configured to be mounted to a bicycle. A chain cage is pivotally coupled to the second end of the main derailleur body between at least a first orientation and a second orientation. A first pulley is rotatably mounted relative to the main derailleur body. A second pulley is rotatably mounted to the chain cage to move therewith relative to the main derailleur body. A third pulley is rotatably mounted to the main derailleur body such that the third pulley engages a chain extending between the first and second pulleys when the chain cage is in the first orientation and disengages the chain upon movement of the chain cage from the first orientation to the second orientation.

Abstract: A bicycle front derailleur includes a fixed member, a chain guide, a linkage assembly and an adjustable mounting fixture. The fixed member includes a frame mounting portion having at least one frame mounting hole and a linkage support portion. The linkage assembly is coupled between the linkage support portion and the chain guide in order to move the chain guide between the retracted position and the extended position. The mounting fixture is adjustably coupled to the fixed member. The mounting fixture including at least one frame fastener disposed in the frame mounting hole, a pair of first washer members disposed on a first side of the frame mounting portion and a pair of second washer members disposed on a second side of the frame mounting portion with the frame fastener extending through the first and second washer members.

Abstract: A front variable speed drive device is configured and arranged to electrically operate driving of a front derailleur by a shift cable. The front variable speed drive device comprises a case member, a motor drive mechanism, and a cable linking portion. The case member is mounted on a hanger portion of a bicycle frame. The motor drive mechanism is mounted on the case member, and has a revolving shaft. The cable linking portion has a retaining portion configured and arranged to retain a first end of the shift cable. The cable linking portion is rotatably mounted on the revolving shaft, and has a hypothetical arm line extending in the direction perpendicular to the shift cable from the center of rotation with a length of the hypothetical arm line changing depending on the rotation phase. Thus, motor torque required for shifting gears is reduced with a simple structure.

Abstract: A bicycle derailleur apparatus comprises a base member for coupling to a bicycle frame, a movable member coupled for movement relative to the base member, a chain guide coupled to the movable member for guiding a chain among a plurality of sprockets in response to movement of the movable member, and a biasing device that provides a biasing force to the chain guide for tensioning the chain. A movement resisting device has a control element for the application of a signal that causes the movement resisting device to change resistance to movement of the chain guide.

Abstract: A bicycle base member adjustment assembly is provided for a base member of a rear derailleur. The bicycle base member adjustment assembly basically has a base member stopper plate, a biasing force adjustment member and a biasing force adjusting element. The biasing force adjusting element is operatively coupled between the base member stopper plate and 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 a rotational axis of the base member. The base member stopper plate has a stopper that limits movement of the base member of the rear derailleur relative to the base member stopper plate. The biasing force adjustment member engages a biasing element of the base member of the rear derailleur. When the biasing force is adjusted, the position of the base member stopper plate is not changed.

Abstract: A transmission system includes transmission case having a work opening formed therein and configured to avoid the necessity for enlarging a transmission case, to prevent an increase in weight and to prevent and inhibit a reduction in the rigidity of the transmission case due to the presence of the work opening. The work opening provides a point of access to permit manual linking/unlinking of an operation cable to/from a derailleur, while ensuring easy oil lubrication for a chain through the work opening. The transmission system also comprises a sprocket cluster constituted of a plurality of transmission sprockets, and a derailleur. The work opening is formed in an axially directed case wall, which is located closest in the axis direction to a transmission sprocket having the largest outer diameter among the sprocket cluster. The same transmission sprocket is located closest in the radial direction to the work opening.

Abstract: A bicycle derailleur includes a mounting member, at least one linkage member, a movable chain guide and a chain guide tensioning mechanism. The mounting member is configured to be attached to a bicycle frame. The linkage member is supported to the mounting member. The movable member is movably coupled to the mounting member via the linkage member. The chain guide is pivotally connected to the movable member to pivot about a pivot axis that extends through the movable member. The chain guide also supports a guide pulley and a tension pulley. The chain guide tensioning mechanism is supported to the movable member at a point spaced apart from the pivot axis configured to bias the chain guide in a direction about the pivot axis.

Abstract: A bicycle component is configured with an axle fixing structure. In the preferred embodiment, the bicycle component is an electric derailleur. The bicycle component has a base member rotatably supported on an axle. Preferably, the axle includes a shaft portion with a head portion disposed adjacent a first end of the shaft portion for limiting axial movement of the base member in a first axial direction of the shaft portion, and a threaded portion disposed adjacent a second end of the shaft portion with external threads. A first locking member is threaded onto the external threads and configured to limit axial movement of the base member in a second axial direction of the shaft portion. Preferably, a second locking member is threaded into the internal threads of the second end of the shaft portion to secure the first locking member on the fastening portion of the axle.

Abstract: A derailleur for a bicycle comprises a base member, a movable member for supporting a chain guide, a linkage mechanism coupling the base member to the movable member, an electrically operated actuating element, and a power storing mechanism. Moving the actuating element causes the movable member to move laterally. A first portion of the power storing mechanism is disposed in a first power transmission path between the actuating element and the movable member, and a second portion of the power storing mechanism is disposed in a different second power transmission path between the actuating element and the movable member. The actuating element comprises a first actuating member and a second actuating member. The first actuating member communicates force in the first power transmission path, the second actuating member communicates force in the second power transmission path, and the first actuating member moves relative to the second actuating member.

Abstract: A bicycle component position correcting device is basically provided with a first sensor, a second sensor, a comparison unit and a position adjuster. The first sensor detects a current absolute value of a positioning angle of a movable part of a bicycle component. The second sensor detects both a movement direction of the movable part and an amount of movement of the movable part. The comparison unit compares the current absolute value of the positioning angle of the movable part to a prestored reference value of the positioning angle of the movable part in response to a component operation command. The position adjuster selectively outputs an adjustment command to the movable part that adjusts the absolute value of the positioning angle of the movable part in accordance with both detected results of the first and second sensors.

Abstract: A mechanism for adjusting spring tension at a derailleur head mountable to a bicycle frame having a limiting stop, includes an orienting washer rotatably mounted to the bicycle frame and having a tail engaging the limiting stop. A coil spring has a first end fixed to the derailleur head and a second end rotatably mounted relative to the orienting washer. An adjusting sleeve in the head rotates the second end of the coil spring relative to the orienting washer, to adjust tension of the spring. A retaining arrangement releasably retains the second end of the spring at a desired angular position after the second end of the spring has been rotated. A bolt secures together the orienting washer, the spring, the sleeve and the retaining arrangement to assemble the mechanism and for mounting the assembled mechanism to the bicycle frame and the derailleur head.

Abstract: A gearshift control device for a chain and sprocket transmission system including a gearshift member that is movable along a transverse direction relative to the plane defined by the chain, a shaft, a first driving element having a drive member that is non-centered or non-concentric with respect to the axis of the shaft, a second positioning element of the derailleur with an indexing device, a third control element mounted to rotate freely about the shaft with a blocking device, and a transmission element having a member for connection with the first driving element, the second positioning element and the third control element, the transmission element being operably between the first driving element, the second positioning element, and the third control element.

Abstract: A method for electronically servo-assisting a bicycle gearshift, including the steps of: a) driving an actuator of a bicycle gearshift to displace a chain of the gearshift in an axial direction with respect to a gearshift group comprising at least two sprockets; b) receiving information on the desired alignment between the chain and a predetermined sprocket of the gearshift group; and c) setting a biunique correspondence between the physical position of the actuator at step b) and a logic value associated with the gear ratio relative to the predetermined sprocket.

Abstract: A bicycle derailleur comprises a base member; a movable member that supports a chain guide, wherein the movable member is coupled to the base member so that the movable member moves relative to the base member for moving a chain among a plurality of sprockets; an intermediate member that mounts the base member to a bicycle frame; a first adjusting mechanism that adjustably sets a position of the intermediate member relative to the bicycle frame; and a second adjusting mechanism that adjustably sets a position of the base member relative to the intermediate member.

Abstract: The bicycle gear mechanism, in particular a rear wheel change mechanism, comprises a derailleur provided with a drive chain guide element. The derailleur comprises: an arm (2); a first attachment element (5), rotatingly constrained to the arm (2) by a first shaft (3), the first attachment element (5) being predisposed to connect the arm (2) to the bicycle frame; a second attachment element (6), rotatably constrained to the arm (2), the second attachment element (6) being predisposed to connect the arm (2) to an element (7) predisposed to guide the drive chain (30) of the bicycle; a mechanism predisposed to rotatingly connect the first shaft (3) and the second shaft (4); at least an actuator, operatively connected to the arm (2) and the bicycle frame, which actuator is predisposed to rotate the arm (2) about the first shaft (3).

Abstract: An apparatus for adjusting a position of a bicycle control device comprises a memory that stores a plurality of operating position values corresponding to a plurality of operating positions, a manually operated adjustment value providing unit that provides an adjustment value, and an updating unit. The updating unit provides a first updated operating position value from a first operating position value from the plurality of operating position values based on the adjustment value, and the updating unit provides a second updated operating position value from a different second operating position value from the plurality of operating position values based on the adjustment value.

Abstract: A bicycle derailleur is basically provided with a base member, a linkage assembly movably coupled to the base member, a movable member movably coupled to the linkage assembly, and a chain guide movably coupled to the movable member. The movable member includes a resin main body, a metallic coupling member fixed to the resin main body and a pivot axle having a first end coupled to the metallic coupling member. The chain guide pivotally coupled to a second end of the pivot axle of the movable member.

Abstract: The rear bicycle derailleur guides a chain to one of a plurality of rear sprockets. The rear derailleur includes a base member, a linkage assembly, a movable member, a chain guide, a biasing member, and a biasing member connection structure. The base member is mounted to the bicycle frame. The linkage assembly is rotatably linked to the base member and the movable member. The movable member is capable of movement toward or away from the frame by rotation of the linkage assembly. The chain guide is pivotally linked to the movable member. The biasing member biases the movable member relative to the base member. The biasing member connection structure attaches the biasing member in either of two different biasing states to selectively bias the movable member toward or away from the frame.

Abstract: The disclosed bicycle gearshift (20) includes a support member (22) configured for mounting on a bicycle frame, a driving member (24) for driving of a bicycle chain, and at least one articulation arm (28) to movably connect the driving member (24) to the support member (22). The articulation arm (28) is connected to at least one portion of the support member (22) and the driving member (24) so that it can rotate about a respective rotational axis (30a) through at least one respective connecting pin (40a) extending along the rotational axis (30a). At least one first rolling element (54) is operatively arranged in the radial direction between the connecting pin (40a), one of the articulation arms (28), the portion of the support member (22), and the driving member (24).

Abstract: A bicycle rear derailleur basically comprises a mounting member, a movable member, a connecting mechanism and a chain guide. The chain guide includes a first plate member, a second plate member, a guide pulley and a tension pulley, with at least one of the first and second plate members including a chain disengagement prevention part arranged between the guide pulley and the tension pulley. The chain disengagement prevention part is arranged to make it more difficult for a chain disengagement prevention part provided on a chain guide to become jammed in a sprocket.

Abstract: A gear reduction apparatus for a bicycle component comprises a gear support, a first gear coupled to the gear support for receiving rotational drive force from a drive component, and a second gear coupled to the gear support for communicating rotational drive force to a driven portion of the bicycle component. The first gear is operatively coupled to the second gear to communicate rotational drive force from the drive component to the driven portion of the bicycle component, and the first gear, the second gear and the gear support are coupled together so that the first gear, the second gear and the gear support may be coupled to and removed from the drive component and the driven portion of the bicycle component as a self-contained unit.

Abstract: A motorized bicycle front derailleur assembly is provided that includes a motor unit, a front derailleur and a motor linkage. The motor unit is configured to rotate an output shaft in first and second opposite rotational directions. The front derailleur includes a fixing body configured to be mounted to a bicycle frame, inner and outer links pivotally coupled to the fixing body at first and second pivot points, and a chain guide pivotally coupled to the inner and outer links to move between an inner shift position and an outer shift position. The first pivot point is located laterally closer to a center plane of the bicycle frame than the second pivot point. The motor linkage is operatively coupled to the output shaft of the motor unit and the inner link to move the chain guide between the inner and outer shift positions upon rotation of the output shaft.

Abstract: A bicycle front derailleur includes a chain guide that is provided with a pushing element that is movable relative to the chain guide to assist in shifting a bicycle chain from a smaller front sprocket to an adjacent larger sprocket. The chain guide is part of a movable member that is movably coupled to a base member via a linkage assembly. The pushing element has a contact surface that preferably moves both laterally outwardly and longitudinally as the pushing element moves from a first position to a second position. Preferably, the pushing element is chain activated and arranged to move at least laterally outwardly by contacting a chain that is moving between inner and outer chain guide members of the movable member. Preferably, the pushing element is either a slidable member or a rotatable member.

Abstract: A derailleur comprises a base member, a movable member; a linkage mechanism including a link member coupled to the base member and to the movable member so that the movable member moves relative to the base member, a motor including a drive member, and a driven member driven by the drive member. The driven member is coupled to the link member so that the link member moves relative to the base member to move the movable member relative to the base member. A clutch is disposed in a power transmission path between the motor and the link member.

Abstract: The chain guide of a bicycle rear derailleur is a chain guide which is connected to a movable member so that this guide is free to swing about a center pivot axis. The chain guide has a pair of plate members rotatably supporting a guide pulley and a tension pulley. One of the plate members is provided with a chain slip prevention part which is disposed between both plate members in the vicinity of the guide pulley. Preferably, the chain slip prevention part has a width of ten mm or greater and fifty mm or less.

Abstract: A bicycle chain guide includes a first guide plate, a second guide plate, a first connection part and a second connection part. The first guide plate has a first chain engagement surface and the second guide plate has a second chain engagement to form a chain receiving area. The first and second connection parts extend between the first and second guide plates to connect the first and second guide plates together at first and second spaced locations, respectively. The first connection part is fixed to the first guide plate by a fastener. The first guide plate has a first abutment and the first connection part has a second abutment. The first and second abutments are arranged at a rear end of the chain guide to limit relative movement of the first and second guide plates.

Abstract: A bicycle rear derailleur is provided that includes a base member, a movable member with a chain guide and a linkage mechanism. The linkage mechanism is coupled between the base member and a movable member to move the chain guide laterally. The base member is configured to be coupled to the bicycle frame. Preferably, at least part of the base member is configured and arranged to be rotatable about a pivot axis that is coincident with a center axis of a rear hub axle. Specifically, the base member preferably includes a fixing portion that is non-movably fixed to the frame and a derailleur support portion that is rotatable relative to the fixing portion. Moreover, the fixing portion preferably includes a cable support structure that is configured to support a derailleur control cable.

Abstract: A chain guide of a bicycle derailleur for displacing a chain between gears that includes inner and outer side plates, a pivot shaft and a thermoplastic connector. The pivot shaft pivotably connects the chain guide to the bicycle derailleur. The thermoplastic connector injection molds the pivot shaft to one of the inner and outer side plates.

Abstract: A bicycle rear derailleur includes a base member, a movable member, a chain cage, a first pulley, a second pulley and a chain guard member. The base member is configured to be mounted to a bicycle. The movable member is movably coupled to the base member. The chain cage is coupled to the movable member to move between at least a first orientation and a second orientation. The first pulley is rotatably mounted relative to the movable member. The second pulley is rotatably mounted to the chain cage to move with the chain cage relative. The chain guard member is movably coupled relative to the movable member. The chain cage includes an engagement portion arranged to move the chain guard member from a first position to a second position when the chain cage is moved from the first orientation to the second orientation.

Abstract: A bicycle rear derailleur comprises a base member; a movable member that supports a chain guide including a pulley that rotates around a pulley axis, wherein the pulley has a pulley plane; and a linking member coupled between the base member and the movable member so that the chain guide moves laterally relative to the base member between a first lateral position and a second lateral position. The base member has a chain receiving space therein.

Abstract: A bicycle rear derailleur equipped with a base component, a link mechanism, a movable component, outer plate, inner plate, guide pulley, and tension pulley. The base component is mounted on the frame and one end of the link mechanism is mounted on the base component. The movable component is mounted on the other end of the link mechanism, and can be relatively displaced from the base component. The outer plate is mounted on the movable component so as to undulate like a see-saw. The guide pulley is mounted between the plates, so as to freely rotate and move in the axial direction. The tension pulley can be engaged with the chain, the engagement center of which is set at a position closer to the outer plate than to the engagement center of the guide pulley, and is mounted between the plates, so as to freely rotate.

Abstract: Rocker arm assembly for the rear derailleur of a bicycle, comprising an outer plate carrying a pivot pin, an inner plate and a pair of idle transmission wheels arranged between the outer plate and the inner plate. The inner plate is made of metallic material and the outer plate is made of a structural fiber fabric incorporated in a thermoplastic material matrix.

Abstract: A bicycle derailleur mounting structure includes a base member and a stopper. The base member includes a first portion configured for attachment to a bicycle frame. The first portion of the base member has a first side surface and a second side surface with an aperture extending between the first and second side surfaces. The stopper is coupled to the base member between the first and second side surfaces. The stopper is configured for setting an angular position of the base member relative to the bicycle frame.

Abstract: A main derailleur body includes a first end and a second end. The first end of the main derailleur body is configured to be mounted to a bicycle. A chain cage is pivotally coupled to the second end of the main derailleur body between at least a first orientation and a second orientation. A first pulley is rotatably mounted relative to the main derailleur body. A second pulley is rotatably mounted to the chain cage to move therewith relative to the main derailleur body. A third pulley is rotatably mounted to the main derailleur body such that the third pulley engages a chain extending between the first and second pulleys when the chain cage is in the first orientation and disengages the chain upon movement of the chain cage from the first orientation to the second orientation.

Abstract: A bicycle derailleur includes a derailleur body, a pivot axle and a chain guide. The pivot axle has a retaining end pivotally retained to the derailleur body and a chain guide supporting end. The chain guide includes a first plate, a second plate and a guide pulley. The first plate is fixedly mounted on the pivot axle to rotate therewith. The second plate is mounted on the pivot axle at location farther from the derailleur body than the first plate. The guide pulley is rotatably mounted on the pivot axle between the first and second plates.

Abstract: A bicycle rear derailleur includes a base member, a movable member, a linkage assembly and an axial spacing adjustment structure. The base member includes a mounting axle configured to be attached to a bicycle frame. The movable member includes a chain guide. The linkage assembly is coupled between the base member and the movable member to move the chain guide between a retracted position and an extended position. The axial spacing adjustment structure is disposed on the mounting axle between the base member and the frame. The axial spacing adjustment structure includes a removeable first spacer and a second spacer, the first spacer having a first axial side facing the frame and a second axial side configured and arranged to engage the second spacer.

Abstract: A bicycle rear derailleur includes a base member, a movable member and a linkage assembly. The base member is configured to be attached to a bicycle frame and includes a first pivot member. The movable member includes a second pivot member, a support portion and a chain guide coupled to the second pivot member. The linkage assembly is coupled between the base member and the support portion of the movable member to move the chain guide between a retracted position and an extended position. The linkage assembly includes at least one third pivot member interconnecting a link to one of the base member and the movable member. At least one of the first, second and third pivot members includes a resilient fastening end.

Abstract: A bicycle rear derailleur includes a base member, a movable member, a torsion spring, a linkage assembly and a damping member. The base member is configured to be attached to a bicycle frame. The movable member includes a support portion and a chain guide coupled to the support portion. The torsion spring is disposed about a pivot member of at least one of the base member and the movable member. The linkage assembly is coupled between the base member and the support portion to move the chain guide between a retracted position and an extended position. The damping member is at least partially disposed between an adjacent pair of coils of the torsion spring.

Abstract: A bicycle derailleur comprises a first base member structured to be detachably mounted to a bicycle frame, wherein the first base member has a first abutment; a second base member structured to be mounted to the first base member, wherein the second base member has a second abutment that faces the first abutment of the first base member and the first and second base members define a housing space between them; a drive mechanism at least partially disposed in the housing space; a link mechanism that moves in response to movement of the drive mechanism; a chain guide coupled to the link mechanism for moving a chain among a plurality of sprockets; and a misalignment inhibiting structure disposed between the first base member and the second base member to inhibit misalignment of the drive mechanism as a result of an external force.

Abstract: An apparatus for achieving the return of a chain to a rear derailleur tension pulley more easily by means of pedaling action when the chain falls off from the tension pulley is provided. The rear derailleur is equipped with a base component, a link mechanism, a movable component, Outer Plate 20, Inner Plate 21, Guide Pulley 22, Tension Pulley 23, and Chain Return Section 32. The base component is a component which is mounted on the frame. The link mechanism is a mechanism of which one end is mounted on the base component. The movable component is a component which is mounted on the other end of the link mechanism, and which can be relatively displaced from the base component. The outer plate is a component which is mounted on the movable component so as to undulate like a see-saw. The inner plate is a component which is installed so as to face the outer plate.

Abstract: A bicycle rear derailleur comprises a base member, a movable member, a linking member coupled between the base member and the movable member so that the movable member moves laterally relative to the base member, and an extension member having a movable member coupling location coupled to the movable member and a guide pulley coupling location offset forwardly of the movable member coupling location. A guide pulley is coupled to the extension member at the guide pulley coupling location for rotation around a guide pulley axis, and a tension pulley is coupled to the movable member below the guide pulley. The guide pulley and the tension pulley are not directly attached to a same member.

Abstract: A front derailleur is provided with an auxiliary bicycle shifting component to minimize reduction in downshifting performance when a chain is located on a chain-entry side of a chain guide. The auxiliary bicycle shifting component basically has a fixed part and a chain contact part. The fixed part is used to fix the chain contact part on the chain guide. The chain contact part is disposed on the chain-entry side of an outer plate of a chain guide of the front derailleur, and is configured and arranged to contact with a chain.

Abstract: A bicycle derailleur is provided with a base member, a movable member, a linkage, a chain guide, an operating mechanism and an adjustment mechanism. The chain guide guides the chain. The movable member is a member that is used to support the chain guide. The linkage is pivotally connected at both ends to the base member and the operating member. The operating member causes the linkage to rotate. The adjustment mechanism is disposed between the linkage and operating member for adjusting the movement of the linkage.

Abstract: A bicycle front derailleur is configured to facilitate a chain returning to a sprocket during an upshifting operation if the chain drops off. The front derailleur basically has a fixed member, a chain guide and a moving mechanism. The fixed member can be fastened to a bicycle. The chain guide has an inner plate and an outer plate with a gap between the outer plate and the inner plate. The chain guide guides the chain between itself and the inner plate. The chain guide is free to move with respect to the fixed member. The inner plate has a first protruding part that protrudes toward the outer plate on the rear end, which is the chain entry side. The moving mechanism is a mechanism that is used to cause the chain guide to move.

Abstract: A bicycle gear-shift actuator having an articulated quadrilateral support with four connecting rods hinged together by four pin elements, and a motor member, having a variable length output shaft that travels along a drive axis between two opposite pin elements to move them for deforming the articulated quadrilateral. Preferably, the drive axis perfectly intersects the pin axis of at least one of the two pin elements.

Abstract: A bicycle derailleur is provided with a chain guide that basically includes inner and outer guide plates, a guide pulley and a tension pulley. The tension pulley is rotatable about a rotation axis between free ends of the guide plates. The tension pulley has an annular recess disposed about the rotation axis to form a projection. The inner guide plate has a guide section with a radially outermost edge. Preferably, the outermost edge of the guide section is located in the annular recess, and the projection projects axially further from a center plane of the tension pulley than the outermost edge. Preferably, the chain guide includes a dust cap coupled between the inner guide plate and the tension pulley. Preferably, the outermost edge of the guide section is located radially inwardly of the projection and radially outwardly of the annular portion of the dust cap.