Abstract: A speed control device which is adapted to be used in connection with a derailleur type bicycle has one operation mode for up-shifting the speed and another operation mode for down-shifting the speed. The two operation modes can be affected by an operation lever, with the operation lever pivoted in a first plane for the up-shifting operation and in a second plane for the down-shifting operation.

Abstract: A clamp device includes a frame including a supporting portion formed on one end thereof. The supporting portion is adapted for abutting against a handle tube. A clamping unit includes two clamping elements. Each clamping element has a connecting portion on one end, a coupling portion on the other end opposite to the connecting portion, and a curved portion between the connecting portion and the coupling portion. The clamping unit is pivotally moved between an open position and a clamping position. The clamping elements are detached from each other in the open position, and the clamping elements are close to each other in the clamping position.

Abstract: A bicycle stem includes a steerer tube base including a pivotal end having a pivotal hole and two blocking devices provided in the pivotal end and slightly protruding from an inner side of the pivotal hole. A clamp arm includes a coupled end pivotally coupled to the pivotal end. A lock unit includes two lock sleeves, an engaged bolt disposed in the pivotal hole of the pivotal end and a blocking element for preventing the engaged bolt from detaching from the pivotal end. The lock unit is operable between a first position and a second position. In the first position of the lock unit, the clamp arm is fixed and can not pivot with respect to the steerer tube base, and in the second position of the lock unit, the clamp arm is able to pivot with respect to the steerer tube base.

Abstract: A bicycle headset includes a lower cup, a bearing, a pressed ring, and an upper cup. The lower cup includes a first surface and a block extended on the first surface. The bearing is engaged in the lower cup. The pressed ring is rotatably engaged in the bearing. The upper cup is rotatably engaged with the lower cup and includes a second surface facing the first surface, and a channel extended in the second surface and having an arc shape. The channel includes first and second stop walls. The channel receives the block and includes the first and second stop walls selectively abutted against the block. The first and second stop walls are distanced from each other with an arc length. The arc length has an angle not greater than 180 degrees.

Abstract: A multiple sprocket assembly for a bicycle includes a larger diametrical sprocket and a smaller diametrical sprocket. The larger diametrical sprocket includes at least one auxiliary guiding portion for facilitating a bicycle chain to shift from the smaller diametrical sprocket to the larger diametrical sprocket.

Abstract: An adjustable seat post is composed of a seat post, a slide member, a locker assembly, and a clamp assembly. The seat post includes a tube and a guide base mounted to a top end of the tube. The slide member is linearly movably mounted on the guide base and includes a through hole running through a top side thereof and a bottom side thereof. The locker assembly includes a locking piece and a linking bar. The locking piece is rotatably mounted in the guide base. The linking bar has a first end movably connected with the locking piece, and a second end pivoted to the slide member and located in the through hole. The clamp assembly is mounted onto the slide member for holding a saddle. In this way, the slide member can be firmly mounted to the guide base.

Abstract: A bicycle seat post includes a head for mounting with a seat, and a tubular body extending downwards from the head and having a hollow portion at a periphery thereof for insertion of a seat tube. Thus, the bicycle scat post can offer a flexible structure to increase the effective contact area between the tubular body and the seat tube, such that the bicycle seat post can be thinly fixed to the seat tube for enhancing the structural stabilization.

Abstract: A shift control device includes a shift-up control apparatus, a shift-down control apparatus and a transmission control assembly. The shift-up control apparatus includes an operable shift-up controller, a first link member connected with the shift-up controller and a first pawl pivotally mounted on the first link member. The shift-down control apparatus includes an operable shift-down controller and a second link member connected with the shift-down controller. The second link member includes first and second actuating members. The transmission control assembly includes a locking member, a housing assembly and first and second pawls. The locking member is moveable in the housing at various positions for various bicycle speed transmissions and includes first and second engaging sections. The first engaging section is selectively engaged by the first pawl of the shift-up control apparatus and the second engaging section is selectively engaged by the first and second pawls of the transmission control assembly.

Abstract: A bicycle hub comprises a central tube having an axial receiving groove for installing an axial shaft of a wheel; a first peripheral disk formed at one end of the central tube; a second peripheral disk formed at another end of the central tube; the second peripheral disk being formed with a plurality of axial insertion holes for receiving radiation spokes; a peripheral of the second peripheral disk being formed with a plurality of ribs; each rib having a penetrating axial installing hole; and each rib of the first peripheral disk having a positioning groove; two ends of the positioning groove being opened at two lateral sides of the rib so as to form the openings; the positioning groove being approximately transversal to an axial direction of the installing hole and a lower side of the installing hole is opened to the positioning groove.

Abstract: A bicycle sprocket assembly comprises a first sprocket unit formed in one piece, a second sprocket unit formed in one piece and being hollow inside, and a third sprocket unit formed in one piece. The first sprocket unit includes at least one sprocket and a first protrusion. The second sprocket unit includes at least two sprockets with different outer diameter, a first recess formed in a side of the larger outer diameter sprocket and a second recess formed in a side of the smaller outer diameter sprocket. The third sprocket unit includes at least one sprocket and a second protrusion. In assembly, the first protrusion of the first sprocket unit engages with the first recess of the second sprocket unit and the second protrusion of the third sprocket unit engages with the second recess of the second sprocket unit.

Abstract: A link plate for a bicycle chain comprises a plate having a first end and a second end. The first end includes an installation hole and an elongated opening. The installation hole includes a first aperture and a second aperture connected to the first aperture. A peak portion is defined between the first aperture and the second aperture to prevent movement of a pin from the second aperture to the first aperture easily. The elongated opening is connected to the first aperture to expand the installation hole slightly as the pin moves from the first aperture to the second aperture.

Abstract: A link plate assembly includes two first plate, two second plate, and two pins. The first plate includes a first aperture, a second aperture and a receiving aperture. Four convex portions facing the second plate are formed on the first plate. The second plate includes a first aperture and a second aperture. Two concave portions facing the first plate are formed on the second plate. One end of each pin is secured to the first aperture of the first plate. The other end of each pin includes a head portion and a groove portion. The head portion passes through the first aperture of the second plates and the receiving aperture of the other first plate. The groove portion passes through the second aperture of the first plate. The convex portions of the first plates contact with a non-concave part of the second plates when assembling. The convex portions coincide with the concave portions to disassemble the link plate assembly as the second plate is rotated relative to the first plate in a predetermined angle.

Abstract: A cable hanger includes a base having an opening defined to stably sleeve on a tube of a bicycle and an adjust unit connected to the base. The base has a tongue outwardly extending therefrom and a through hole defined in the tongue. The adjust unit comprising an adjust base and an adjuster is partially mounted in the through hole. The adjust base is mounted on the tongue and has a hole aligned with the through hole for receiving the adjuster. The adjuster has a through hole aligned with the through hole in the tongue for adapting a cable. The cable passes through the through holes in the adjuster and the tongue. A tension of the cable is adjusted by a movement of the adjuster relative to the tongue.

Abstract: A bicycle seat post includes two arcuate plates and a reinforcement board sandwiched between the two arcuate plates. Each arcuate plate has two lengthwise end surfaces and each end surface includes an inner corner edge and an elongate surface defined in an outer corner edge thereof. The two lengthwise end surfaces contact two opposite sides of the reinforcement board. Each of lengthwise top surface and lengthwise bottom surface of the reinforcement board is connected between the two respective elongate surfaces of the two arcuate plates so as to form two longitudinal grooves in an outer surface of the seat post.