Abstract: A method for making a crank of a bicycle includes preparing a first prepreg material and a second prepreg material, a first connector and a second connector, and a bladder in a mold insert. The first and second connectors are separated from each other. The first and second connectors are buried in the first prepreg material and includes an extension extended between the first and second connectors. The bladder is curved around the first prepreg material. The first prepreg material, the first and second connectors are buried in the second prepreg material. Then, heat-pressing the first and second prepreg materials, the first and second connectors, and the bladder.

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 method for making a crank of a bicycle includes preparing a prepreg material and a bladder, heat-pressing the prepreg material and the bladder, cutting the prepreg material and the bladder to form two engaging sections to engage with two connectors, wrapping a carbon-fiber cloth, and heating the prepreg material and first and second connectors that is wrapped by the carbon-fiber cloth.

Abstract: A seat support structure of a bicycle comprises a seat supporting tube; a seat supporting rod received in the seat supporting tube; a lower lateral side of the seat supporting rod having a first inclined surface; the seat supporting rod being formed with an upper hole and a lower tapered hole; a tightening assembly received in the seat supporting tube; the tightening assembly having a tightening unit, an embedding unit; and a stud; in assembly, a screw post of a stud passes through the upper hole, the lower tapered hole, the stud hole of the tightening assembly and the embedding hole of an embedding hole so as to combine the tightening assembly to the seat supporting rod; then the seat supporting rod and the tightening assembly are placed within the seat supporting tube.

Abstract: A bicycle seat tube adjusting assembly includes: a rod body which is installed with a positioning seat; a first clamping unit and a second clamping unit being assembled with the positioning seat; two channels being formed between the first clamping unit and the second clamping unit for clamping; an adjusting unit installed with the second clamping unit; the adjusting unit having at least one protrusion and at least one tightening unit abutting against the protrusion; and a positioning unit resting against the positioning seat; and wherein by the adjusting unit, the first clamping unit and second clamping unit are adjusted on the positioning seat so as to provide a preferred riding position.

Abstract: A bicycle seat tube adjusting assembly includes: a rod body which is installed with a positioning seat; a first clamping unit and a second clamping unit being assembled with the positioning seat; two channels being formed between the first clamping unit and the second clamping unit for clamping; an adjusting unit installed with the second clamping unit; the adjusting unit having at least one protrusion and at least one tightening unit abutting against the protrusion; and a positioning unit resting against the positioning seat; and wherein by the adjusting unit, the first clamping unit and second clamping unit are adjusted on the positioning seat so as to provide a preferred riding position.

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 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 seat support structure of a bicycle comprises a seat supporting tube; a seat supporting rod received in the seat supporting tube; a lower lateral side of the seat supporting rod having a first inclined surface; the seat supporting rod being formed with an upper hole and a lower tapered hole; a tightening assembly received in the seat supporting tube; the tightening assembly having a tightening unit, an embedding unit; and a stud; in assembly, a screw post of a stud passes through the upper hole, the lower tapered hole, the stud hole of the tightening assembly and the embedding hole of an embedding hole so as to combine the tightening assembly to the seat supporting rod; then the seat supporting rod and the tightening assembly are placed within the seat supporting tube.

Abstract: A front speed change device comprises a base, a first linking rod, a second linking rod and a chain guide unit. The body serves to fix the body to a seat tube. The first linking rod has one end pivoted to the base and another end thereof is pivoted to the chain guide unit. The second linking rod has one end pivoted to the base and another end thereof is pivoted to the chain guide unit. The chain guide unit includes an outer guide sheet and an inner guide sheet. Two ends of the outer guide sheet are connected to the two ends of the inner guide sheet. A receiving body is formed therebetween for receiving a chain; and the outer guide sheet is formed with a first end surface, a second end surface, a third end surface and a fouth end surface.

Abstract: A sprocket wheel of a bicycle comprises a large sprocket having a plurality of teeth; a small sprocket having a plurality of teeth; and a chain. For each tooth of the large sprocket and small sprocket, a first lateral side of the tooth has a first edge line at a top end thereof; the first lateral side is cut inwards from to form as a notch; the notch is a cambered surface and a lower side of the notch is confined by a second edge line. In assembly, the first lateral side of the large sprocket is placed to be adjacent to a small sprocket so as to reduce interferences and noises in driving. The topside of the tooth has the first edge line and a third edge line; and the topside of the tooth is an inclined to a wheel surfaces.

Abstract: A method for manufacturing a bicycle crank, comprises the steps of: blowing air into a blowing opening at a lower end of a backbone so as to fixing the backbone; wherein the backbone has a first embedding portion; using a cutter to cut the backbone; and then form a second embedding portion in the end of the backbone having the blowing opening; winding an unidirectional carbon-fiber cloth around the backbone; adhering carbon-fiber adhesive sheet upon an outer side of the backbone; and heating the backbone so as to firmly secure the carbon-fiber adhesive sheet to the backbone. Furthermore before the blowing step, the method further comprises a step of forming a first embedding portion at one end of the backbone; and embedding a metal first tube into the first embedding portion.

Abstract: A chain wheel comprises a chain wheel body formed with a plurality of combining holes for assembly a crank of a bicycle and a plurality of through holes for riveting so that the chain can be engaged with different chain wheel body for speed change; the chain wheel body including an outer periphery and an inner periphery; the outer periphery being formed with a teeth portion with a plurality of tooth for engaging with a chain; a coarse portion formed at a back surface of the chain wheel body; and a combining portion covering upon a part of the outer periphery and both at the front surface and back surface of the chain wheel body; the combining portion being extended through the inner periphery so as to be combined as an integral body at both the front surface and back surface of the chain wheel body.

Abstract: A bicycle handle device comprises a combining portion having a round cylindrical shape; each of two ends of the combining portion being extended with an inclined wing; one end of the wing far away from the combining portion being installed with a handle; each connection of the combining portion and the wing being extended with an auxiliary handle; each auxiliary handle being approximately vertical to the combining portion; a front end of each auxiliary handle far away from the combining portion being bent upwards; a length of the combining portion being approximately equal to that of each wing; a stand tube of a bicycle can be movably installed to the combining portion; the lengths of two auxiliary handles being approximately equal; and a connection of the combining portion and the auxiliary handle being installed with a seat for supporting a cambered supporting plate which has a sheet like structure.

Abstract: A teeth disk comprises one surface of the teeth disk having a plurality of recesses which do not penetrate through the teeth disk; and a bottom of each recess is formed as a stop. Each recess has a cambered shape which is arranged near an edge of the teeth disk. A plurality of teeth are formed along the edge of the teeth disk for engaging to a chain of a bicycle. The teeth disk has a ring structure with a hollow central hole for installing a crank. An inner edge of the central hole is protruded with a plurality of ears; and each ear has an ear hole for combining with a crank.

Abstract: A combination of derailleur shifter and brake lever for bicycles includes a lever which can be pivoted relative to the handlebar so as to respectively control the braking mechanism and the derailleur gears. The lever has a rod connected thereto which controls a driving pawl unit which allows the rider to operate the rack of a driving unit to pull or release the derailleur cable.

Abstract: A speed change device of a bicycle comprises a body having a ring clamping portion and a driven portion; the driven portion being connected to a chain driving sheet; an L shape driven arm pivoted to the body; one end of the driven arm being installed with a connecting portion; and another end thereof being installed with a pivot portion; the pivot portion being pivoted to the chain driving sheet; wherein the chain driving sheet is driven by the driven arm to achieve the object of moving a chain received in the chain driving sheet and to change speed of a bicycle. A bending portion of the L shape driven arm has a cambered shape. The connecting portion of the driven arm receives a speed change rope.

Abstract: A bicycle head assembly comprises an assembly seat; a bearing being installed in the assembly seat; an inner side of the bearing being rotatably installed with a stand tube of a bicycle; a washer formed by winding a substrate through several circles so as to have a form of a spring; thereby the washer being elastic and compressible; the washer being received into the assembly seat so as to position the bearing and thus the bearing is combined into the assembly seat. All cycles of the washer have a same diameter, or the washer has a tapered shape. The substrate is a flat and long substrate.

Abstract: A crank assembly includes a crank having a recess defined in a first end thereof and the recess includes an open end in an inside of the crank and a close end on an outside of the crank. A deformable material is located at an inner periphery of the recess. An axle has a groove defined in an outer periphery thereof and the deformable material is deformed and force-fitted into the groove of the crank when an end of the axle is inserted into the recess. The axle further includes a flange which seals the open end of the recess.

Abstract: A bicycle crank includes a hollow body made by composite material and two metal connection members are connected on two ends of the hollow body. A mold includes an elongate cavity and two metal connection members are put in the cavity. Composite material arranged as a loop is put in the elongate cavity and the two metal connection members are enclosed within the loop of the composite material. Two inflatable bladders are put in the elongate cavity and each bladder has a closed end and an open end. The two bladders are arranged along two long sides of the elongate cavity. The two inflatable bladders are inflated by introducing high temperature air from the open ends and push the loop of the composite material to contact against the inside of the elongate cavity and the composite material is solidified and combined with the metal connection members.