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 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 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 drive mechanism for a bicycle transmission assist mechanism includes a crank arm having a drive member. The drive member includes a first abutment facing a forward rotational direction of the crank arm and a non-concave sloped surface facing a rearward rotational direction of the crank arm.

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 drive mechanism for a bicycle transmission assist mechanism includes a crank arm having a drive member. The drive member includes a first abutment facing a forward rotational direction of the crank arm and a non-concave sloped surface facing a rearward rotational direction of the crank arm.

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 top pull type front derailleur is designed to move or shift a chain between two or more sprockets for changing gears. The front derailleur basically has a bicycle frame clamping band, a linkage assembly and a chain guide. The linkage assembly includes a cable connection point and is arranged between the bicycle frame clamping band and the chain guide to move the chain guide laterally towards and away from the clamping band. The clamping band has a top pull cable guide surface that is configured and arranged relative to the clamping band to guide a cable from vertically above the clamping band to the cable connection point when the front bicycle derailleur is operatively mounted to a bicycle frame. Preferably, the top pull cable guide surface is formed on a peripheral surface of a roller that is rotatably mounted on the clamping band.

Abstract: A front derailleur includes a fixed member, a chain guide and a linkage assembly. The fixed member has a mounting portion and a pair of mounting flanges axially spaced from each other. The linkage assembly is coupled between the chain guide and the fixed member to transversely move the chain guide. The linkage assembly includes first, second and third links. The first link is pivotally coupled to the fixed member for rotation about a first axis. The second link is pivotally coupled to the mounting flanges for rotation about a second axis. The third link is coupled to the chain guide and movably coupled to the first and second links to form a four-bar linkage together with the fixed member. The mounting flanges preferably have different axial widths. The second link preferably has a longitudinal dimension of least about 45.0 millimeters.

Abstract: A front derailleur includes a fixed member, a chain guide and a linkage assembly. The fixed member has a mounting portion and a pair of mounting flanges axially spaced from each other. The linkage assembly is coupled between the chain guide and the fixed member to transversely move the chain guide. The linkage assembly includes first, second and third links. The first link is pivotally coupled to the fixed member for rotation about a first axis. The second link is pivotally coupled to the mounting flanges for rotation about a second axis. The third link is coupled to the chain guide and movably coupled to the first and second links to form a four-bar linkage together with the fixed member. The mounting flanges preferably have different axial widths. The second link preferably has a longitudinal dimension of least about 45.0 millimeters.

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 has a fixed member, a movable member, linkage assembly and cable attachment assembly. The cable attachment assembly has a cable fixing bolt, cable fixing washer and a first resilient member. The first resilient member is arranged to retain the cable fixing washer on the shaft portion of the cable fixing bolt is located. The fixed member includes a derailleur fixing bolt, a derailleur fixing washer, and a second resilient member. The second resilient member is arranged to retain the derailleur fixing washer on the shaft portion of the derailleur fixing bolt.

Abstract: A drive mechanism for a bicycle transmission assist mechanism includes a crank arm having a drive member. The drive member includes a first abutment facing a forward rotational direction of the crank arm and a non-concave sloped surface facing a rearward rotational direction of the crank arm.

Abstract: A drive mechanism for a bicycle transmission assist mechanism includes a crank arm having a drive member. The drive member includes a first abutment facing a forward rotational direction of the crank arm and a non-concave sloped surface facing a rearward rotational direction of the crank arm.

Abstract: A bicycle front derailleur has a fixed member, a movable member, linkage assembly and cable attachment assembly. The cable attachment assembly has a cable fixing bolt, cable fixing washer and a first resilient member. The first resilient member is arranged to retain the cable fixing washer on the shaft portion of the cable fixing bolt is located. The fixed member includes a derailleur fixing bolt, a derailleur fixing washer, and a second resilient member. The second resilient member is arranged to retain the derailleur fixing washer on the shaft portion of the derailleur fixing bolt.

Abstract: A front derailleur includes a fixed member, a chain guide and a linkage assembly. The fixed member has a mounting portion and a pair of mounting flanges axially spaced from each other. The linkage assembly is coupled between the chain guide and the fixed member to transversely move the chain guide. The linkage assembly includes first, second and third links. The first link is pivotally coupled to the fixed member for rotation about a first axis. The second link is pivotally coupled to the mounting flanges for rotation about a second axis. The third link is coupled to the chain guide and movably coupled to the first and second links to form a four-bar linkage together with the fixed member. The mounting flanges preferably have different axial widths. The second link preferably has a longitudinal dimension of least about 45.0 millimeters.

Abstract: A top pull type front derailleur is designed to move or shift a chain between two or more sprockets for changing gears. The front derailleur basically has a bicycle frame clamping band, a linkage assembly and a chain guide. The linkage assembly includes a cable connection point and is arranged between the bicycle frame clamping band and the chain guide to move the chain guide laterally towards and away from the clamping band. The clamping band has a top pull cable guide surface that is configured and arranged relative to the clamping band to guide a cable from vertically above the clamping band to the cable connection point when the front bicycle derailleur is operatively mounted to a bicycle frame. Preferably, the top pull cable guide surface is formed on a peripheral surface of a roller that is rotatably mounted on the clamping band.

Abstract: A drive mechanism for a bicycle transmission assist mechanism includes a crank arm having a drive member. The drive member includes a first abutment facing a forward rotational direction of the crank arm and a non-concave sloped surface facing a rearward rotational direction of the crank arm.

Abstract: A front derailleur mounting arrangement includes a bottom bracket tube and a front derailleur mounting bracket having first and second complementary mounting structures. The first and second complementary mounting structures are configured to retain the front derailleur mounting bracket in a predetermined rotational orientation and a predetermined axial orientation on an axial end edge of the bottom bracket tube prior to threading of a bottom bracket within the interior threaded passage of the bottom bracket tube. One of the first and second complementary mounting structures is formed as a slot and the other of the first and second complementary mounting structures is formed as a projection that mates with the slot.

Abstract: A front derailleur includes a fixed member, a chain guide and a linkage assembly. The fixed member has a mounting portion and a pair of mounting flanges axially spaced from each other. The linkage assembly is coupled between the chain guide and the fixed member to transversely move the chain guide. The linkage assembly includes first, second and third links. The first link is pivotally coupled to the fixed member for rotation about a first axis. The second link is pivotally coupled to the mounting flanges for rotation about a second axis. The third link is coupled to the chain guide and movably coupled to the first and second links to form a four-bar linkage together with the fixed member. The mounting flanges preferably have different axial widths. The second link preferably has a longitudinal dimension of least about 45.0 millimeters.