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.

Abstract: A bicycle crank includes a connection end for being connected to an axle of bottom bracket and a remote end for being connected to a pedal. The remote end extends off from a longitudinal axis of the crank. A first side of the crank has a thick and rounded configuration and a second side has a narrow configuration.

Abstract: A crank shaft assembly includes a socket, a crank shaft, two roller bearings, two mounting portions, two covers, and two steel ball sets. Thus, the roller bearings and the steel ball sets are arranged in different axial directions to bear the forces of two different directions. In addition, the roller bearings and the steel ball sets are arranged in different axial directions to increase the force bearing area of the crank shaft assembly, thereby preventing from producing stress concentration, so as to increase the lifetime of the crank shaft assembly.

Abstract: This invention is directed to an improved flywheel structure capable of shortening rotation travel and having a relatively long service life. The flywheel structure includes a first ratchet pawl set having a plurality of equidistantly spaced apart ratchet flocks and fitted to the periphery of a wheel seat. The wheel seat has fitted therein a tooth disk which has ratchet teeth on the periphery thereof so that the tooth disk can engage or rotate reversely relative to the tooth disk. The invention is characterized in that a second ratchet pawl set is formed on the wheel seat and has a set of series equidistantly spaced apart ratchet blocks. The ratchet blocks of the second ratchet pawl set and the ratchet blocks of the first ratchet pawl set are staggered. The second ratchet pawl set is located within range of one ratchet tooth width at the inner edge of the tooth disk of forward or rearward displacement of equidistant angle of the first ratchet pawl set.

Abstract: A bicycle crankshaft assembly in accordance with the present invention comprises a frame tube having first and second end portions and defining a passage extending between the end portions. The first end portion define a first opening, and the second end portion define a second opening different to the first opening. An axle is securely assembled into the passage from the second end portion and the axle includes a bushing with a crankshaft rotationally supported therein. The crankshaft includes first and second coupling portions extending over the first and second openings of the first and second end portions of the frame tube. Wherein the first opening is dimensioned such that a first end of the bushing is limited from extending therethrough.

Abstract: A method of making a bicycle crank arm bar by casting, forging, rolling, heat molding, and cold forging. The bicycle crank arm has an elongated cavity, an axle end, and a pedal end.

Abstract: A bottom bracket for bicycles includes a tube with a hollow shaft received therein and two first grooves are defined in an outer periphery of the hollow shaft. Two collars each have a second groove are mounted to the hollow shaft and balls are engaged with the first grooves and the second grooves. An inner tube is mounted to the hollow shaft and engaged between the two collars. Two races are respectively engaged with two ends of the tube and each race has a positioning flange for engaging with two respective second ends of the collars.

Abstract: A bicycle crank arm. The crank arm includes a main body, an axle fastening member fastened with one end of the main body, a pedal fastening member fastened with other end of the main body, and a cover body of a carbon fiber material for embedding the main body, the axle fastening member and the pedal fastening member. The main body is provided at one end thereof with a first male threaded portion, and at other end thereof with a second male threaded portion. The axle fastening member is provided with a female threaded portion, which is engaged with the first male threaded portion of the main body. The pedal fastening member is provided with a female threaded portion, which is engaged with the second male threaded portion of the main body. The axle fastening member and the pedal fastening member are provided in the external surface thereof with a plurality of protrusions, which are anchored in the cover body.

Abstract: A bicycle crank axle comprises an axle, which is provided with two fitting portions located at both ends thereof. Each of the two fitting portions is fitted into a tapered sleeve, which is in turn fitted into a fixation seat. The fixation seat is provided with a tapered center hole in which a tapered fixation ring, a tapered bearing seat, a C-shaped ring, a pillar holder of a tapered construction, a plurality of tapered pillars, a washer, and a fixation seat cover are provided. The tapered pillars are intimately held by the pillar holder to provide the axle with protection against idle running and mechanical wear.

Abstract: A bicycle axle comprises a shaft on which two fastening seats are mounted with, one of the two fastening seats is provided with inner threads and the other one the two fastening seats being provided with a tapered inner wall cooperating with a tapered outer wall of a fastening piece. The five-way tube of the bicycle frame is securely fastened between the two fastening seats.

Abstract: An improved crank axle for bicycle is a hollow hub axle provided with a circle of tooth shape key slot at both ends respectively, arranged with a single roller bearing and the two parallel ball bearings and covered with an aluminum alloy cone-shaped sleeve. So that its can reduce the weight, facilitate assembling, keep axle rotation smoothly and receive loading strength well.

Abstract: A supporting bracket is provided so that the braking pad may be readily controlled by a single braking cable and the steering angle of the handlebar will not be limited. The supporting bracket of the invention is specially suitable for terrain and acrobatic exercise applications. The present invention overcomes the difficulty or shortcoming of the conventional supporting bracket. The inventive bracket features a simplified configuration that may be readily constructed and assembled. Furthermore, the cost may be lowered, thus having economic value.

Abstract: An improved crank axle for bicycle in which the tapered sleeve and the tapered bearing is provided with a retaining ring such that the tapered sleeve and the tapered bearing are integrally interconnected. The overall rigidity is enhanced and the service life is prolonged. A water-proof effect can be also attained and the crank axle can be quickly manufactured and assembled.

Abstract: A crank gearwheel assembly for use with a bicycle, mainly includes a hollow crank body and a pair of integrated gearwheels of different diameters coupled to the crank body thereby avoiding an angular deviation between the gearwheels, and offering easy assembly, accurate speed-change, and reduced weight for a more light and speedy bicycle.

Abstract: A hub of a bicycle includes a hub shell which has two dust caps threadedly engaged to both ends of the hub shell, a sleeve inserted in the hub shell and located between the two dust caps, an axle rotatably inserted in the sleeve and has a first and a second flanges extending therefrom for a bearing disposed between the first flange and one of the two dust caps and between the second flange and the other dust cap, the axle having a third and a fourth flanges extending therefrom between the first and the second flanges, a first bearing and a second bearing respectively disposed between the first and the third flanges and between the second and the fourth flanges.

Abstract: A bicycle brake assembly includes a caliper brake mechanism attached to a bicycle frame which has a bottom bracket through which an axle is rotatably received, an activating member fixedly mounted on the axle and having a tubular portion extending from one of two sides thereof wherein the tubular portion has a threaded portion defined in an outer periphery thereof, a casing having a hole defined therein for the activating member rotatably received therein and a ring threadedly engaged with the threaded portion of the activating member, the hole of the casing having a plurality of ratchet gears extending radially from an inner periphery thereof, the activating member having a plurality of ratchets extending therefrom to contact the ratchet gears, the casing having a lug extending radially from an outer periphery thereof and a brake cable connected between the lug and the caliper brake mechanism such that the caliper brake mechanism is activated by inversely rotating cranks attached to two ends of the axle.