Abstract: A crank arm is provided, which includes a first connecting member and a second connecting member used for joining the first connecting member. The first connecting member has a first wall surface, the first wall surface is provided with a joint wall of an annular structure, and a wall surface of the joint wall is a concave-convex surface. The second connecting member is provided with a second wall surface opposite to the first wall surface, an annular wall and two facing ribs extend from the second wall surface, and the annular wall and the ribs have a groove there-between for fitting the joint wall therein. Therefore, a contact area of the first connecting member and the second connecting member is increased, and a shear force resisting function is provided.

Abstract: A quick-assembly front wheel device of a bicycle is pivotally disposed on a single-bladed fork and includes a wheel and a brake disc. The single-bladed fork has a pivotal end, the pivotal end has a first surface and a second surface, a shaft hole is opened passing through the first surface and the second surface, the wheel is located on the first surface and has a first axle shaft passing through the shaft hole, and the brake disc is located on the second surface and has a second axle shaft to pass through the shaft hole. The first axle shaft and the second axle shaft can be butted together. Therefore, the front wheel is capable of being quickly disassembled and mounted.

Abstract: A method for manufacturing a carbon fiber rim is disclosed, which includes: preparing a carbon fiber composite material and a thermosetting resin-based composite material; preparing a mold to place the carbon fiber composite material into the mold so that the carbon fiber composite material forms a pre-molded rim according to the shape of the mold, and then annularly affixing the thermosetting resin-based composite material respectively to brake surfaces on both sides of the pre-molded rim, so as to form a brake layer; placing the pre-molded rim into the mold to integrally form a rim by means of heat and pressure; and taking out the rim having the brake layer on the surface.

Abstract: A cogset, which is adapted to connect to a rotatable hub in a bicycle, includes a first cog, a second cog connected to the first cog, and a support element installed to the second cog. A limiting side of the support element is abutted against a side of the second cog. The support element is mounted by the first cog. Each of the first and second cogs is not directly connected to the rotatable hub.

Abstract: A hydraulic brake handle assembly, wherein the response time of the hydraulic brake caliper can be much improved, and the brake action can be carried out immediately. When the brake lever is pressed, the volume of the oil pushed by the piston is doubled due to the hydraulic brake handle assembly is provided with two piston portions inserted in two oil chambers. Since the response time of the hydraulic caliper of the present invention is improved, it allows the brake pads of the hydraulic caliper to be assembled at a relatively large distance from the brake disc, so that sand won't get struck between the brake pads and the brake disc, and the brake disc remains useful when they are bent out of plain rubbing after using.

Abstract: A quick release attachment for a bicycle includes an attachment device, a bracket and a quick release assembly. The attachment device has a main connecting body. The main connecting body has a retaining groove. The bracket has a sub connecting body. The bracket has a connecting portion defined at one lateral side thereof. The connecting portion has an opening defined therethrough. The quick release assembly has a quick release member and an abutting block. The quick release member is assembled with the connecting portion and defines a tightening position and a releasing position. The abutting block is received in the opening of the bracket. When the pivot portion is on the tightening position, the abutting block is engaged with the retaining groove of the main connecting body so that the attachment device is secured to the bracket.

Abstract: A multi-position adjustable height seat post comprises an inner tube, an outer tube, a locking assembly, a triggering device, a first extending element, and a second extending element disposed between the tubes. The locking assembly comprises an actuating unit, a plurality of parallel grooves located in the outer tube, a plurality of spherical detent elements located, in the grooves, and a plurality of spherical elements located in the inner tube. The triggering device connects to the actuating unit. The first extending element constantly pushes the to actuating unit moving in a first direction. The second extending element disposes between the tubes. Once the triggering device is triggered, the actuating unit moves in a second direction contrary to the first direction and makes the spherical elements to move inward laterally to let the inner tube and outer tube move relative to each other freely.

Abstract: A hydraulic brake master cylinder includes a cylinder unit having first and second spaces, a channel communicating the spaces and an adjuster exposed outside; a piston slidably disposed in the first space; a first spring applying an elastic force to the piston; a rod moving relative to the piston; a second spring applying an elastic force to the rod; a seal attached to the rod and moving controllably to seal the channel; and a nut threaded onto the rod. The adjuster is rotatable to make the nut and the rod rotate with respect to each other so as to change the distance between the seal and the end of the channel to adjust the free stroke.

Abstract: A handlebar includes a main body and two grip portions. The main body includes at least one extending portion extended away from the main body, and at least one through hole opened on the extending portion. The two grip portions are formed at opposite ends of the main body. The advantage of the handlebar is to omit the stem that can lighten the weight and reduce the wind resistance to make the riders safer and comfortable riding.

Abstract: A bicycle stern with a shock absorber which is mounted between a handlebar and a steering tube includes a stem body, a clamping member and an elastomer. The stem body has a clamping portion formed at one end thereof, and two fork portions formed at another end of the stein body. The clamping member is connected with the clamping portion for clamping the handlebar, and the elastomer is disposed between the two fork portions. Under this arrangement, when a shock is generated from the rough road, the elastomer is compressed by the two fork portions, so that the elastomer is deformed appropriately and absorbs the shock from the road. Therefore, a rider could hold the handlebar comfortably.

Abstract: The present invention relates to an anchoring device for anchoring a bicycle saddle to a seatpost. The anchoring device comprises a first component adapted to receive a frame of the saddle, a second component detachable fixed on the first component for holding the frame of the saddle, and a third component adapted to be fixed to the seatpost. The first component and the third component are detachably mounted to each other in a male-female manner that allows a quick release of the saddle from the seatpost.

Abstract: A bicycle rim includes a body having an axis defining a center thereof. The body includes an outer periphery and an inner periphery. The outer periphery and the axis have an outer radius therebetween, and the outer radius is constant. The inner periphery includes a first portion having a non-constant diameter.

Abstract: A multi-position adjustable height seat post comprises an inner tube, an outer tube, a locking assembly, a triggering device, a first extending element, and a second extending element disposed between the tubes. The locking assembly comprises an actuating unit, a plurality of parallel grooves located in the outer tube, a plurality of spherical detent elements located, in the grooves, and a plurality of spherical elements located in the inner tube. The triggering device connects to the actuating unit. The first extending element constantly pushes the to actuating unit moving in a first direction. The second extending element disposes between the tubes. Once the triggering device is triggered, the actuating unit moves in a second direction contrary to the first direction and makes the spherical elements to move inward laterally to let the inner tube and outer tube move relative to each other freely.

Abstract: A hydraulic brake master cylinder includes a cylinder unit having first and second spaces, a channel communicating the spaces and an adjuster exposed outside; a piston slidably disposed in the first space; a first spring applying an elastic force to the piston; a rod moving relative to the piston; a second spring applying an elastic force to the rod; a seal attached to the rod and moving controllably to seal the channel; and a nut threaded onto the rod. The adjuster is rotatable to make the nut and the rod rotate with respect to each other so as to change the distance between the seal and the end of the channel to adjust the free stroke.

Abstract: A hydraulic brake handle assembly, wherein the response time of the hydraulic brake caliper can be much improved, and the brake action can be carried out immediately. When the brake lever is pressed, the volume of the oil pushed by the piston is doubled due to the hydraulic brake handle assembly is provided with two piston portions inserted in two oil chambers. Since the response time of the hydraulic caliper of the present invention is improved, it allows the brake pads of the hydraulic caliper to be assembled at a relatively large distance from the brake disc, so that sand won't get struck between the brake pads and the brake disc, and the brake disc remains useful when they are bent out of plain rubbing after using.

Abstract: A speed control device, which is adapted to be used in connection with a derailleur type bicycle or an internal gear hub 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 second rotation direction for the up-shifting operation and in a first rotation direction for the down-shifting operation.

Abstract: A bicycle crank set is comprising a crank having at least one support portion protruding therefrom, a first lateral surface, a second lateral surface opposite to the first lateral surface; a first chain wheel located at the first lateral surface and having a second through hole; a second chain wheel located at the second lateral surface and having at least one threaded hole; and a screw bolt inserted outward through the second through hole and then the first through hole to be engaged with the threaded hole. Accordingly, the bicycle crank set is structurally simple and convenient in assembly and the head of the screw bolt is hidden at the inner side of the crank set to be aesthetic in appearance.

Abstract: A bicycle drive assembly includes a spindle installed in a bicycle, a first crank arm and a second crank arm respectively mounted at two distal ends of the spindle, the first crank arm being rotatable on the axis of the spindle in a first direction of rotation to drive the bicycle forwards, the first crank arm being fastened to the spindle by a screw joint in a second direction of rotation that is the same direction of the first direction of rotation to ensure tight connection between the first crank arm and the spindle when the user is riding the bicycle to pedal the first crank arm.

Abstract: A dual-pivot brake includes first and second caliper arms linked together and disposed symmetrically with respect to each other. The dual-pivot brake further includes an exoskeleton bridge including a two-piece bridge member consisting of first and second bridge members. The first and second bridge members are interconnected together by first and second axles, respectively. The first and second caliper arms are pivotally mounted on the first and second axles respectively and selectively move toward or away from each other in the operation of the dual-pivot brake.