Abstract: A head tube assembly for a bicycle has a frame, a lower tube, an upper tube and a cover. The lower tube is mounted in the front end of the frame and has a top, a bottom and a lower bearing mounted in the bottom of the lower tube. The upper tube has a top, a bottom detachably connected to the top of the lower tube and an upper bearing mounted in the top of the upper tube. The cover is detachably mounted on the top at the front end of the frame and has a through hole mounted around the top of the upper tube.

Abstract: A head tube assembly for a bicycle has a frame, a lower tube, an upper tube and a cover. The lower tube is mounted in the front end of the frame and has a top, a bottom and a lower bearing mounted in the bottom of the lower tube. The upper tube has a top, a bottom detachably connected to the top of the lower tube and an upper bearing mounted in the top of the upper tube. The cover is detachably mounted on the top at the front end of the frame and has a through hole mounted around the top of the upper tube.

Abstract: A bicycle frame has a front frame, a mounting bracket assembly, a rear frame and a shock absorbing device. The front frame has a head tube, a down tube, a top tube, a bottom bracket shell and a seat tube. The seat tube is connected to bottom bracket shell, is connected to the rear end of the top tube and has an upper bracket seat, a connecting bracket and a lower bracket seat. The mounting bracket assembly is connected pivotally to the front frame and has two front mounting brackets and a rear mounting bracket. The rear frame is connected pivotally to the mounting bracket assembly and the front frame and has an upper fork, a lower fork and two dropouts. The shock absorbing device is connected to the front frame, the rear frame and the mounting bracket assembly and has a first shock absorber and a second shock absorber.

Abstract: A bicycle frame has a front frame, a rear frame and a shock absorber. The front frame has a head tube, a down tube, a top tube, a bottom bracket shell and a seat tube. The seat tube is connected to and protrudes up from the bottom bracket shell, is connected to the top tube and has a jacket and a threaded hole. The jacket is connected to the shock absorber and has an opening and a chamber. The rear frame is connected pivotally to the front frame and has a lower fork, two dropouts and an upper fork. The upper fork is connected to the dropouts and the shock absorber and has two bottom ends, a top end and two fasteners. The shock absorber is mounted between the seat tube and the upper fork and has a sleeve, an elastomer, a connecting pipe and a shaft.

Abstract: A transmission for an electric bicycle has a motor having an output axle extending into the housing and a driving gear secured on the output axle and engaged with an idler. A crank axle has a first non-return means assembled between the stepped sleeve and the driven gear, and a second non-return means assembled between the stepped sleeve and the crank axle. A seat has a first gear rotatably provided on the crank axle and having a first end secured in the second non-return means, a second gear secured on the crank axle, a duplicate gear engaged with the first gear and the second gear, and a nose provided on an outer surface of the seat. A force sensor is assembled on an inner wall of the housing and corresponding to the nose.

Abstract: A transmission for an electric bicycle has a motor having an output axle extending into the housing and a driving gear secured on the output axle and engaged with an idler. A crank axle has a first non-return means assembled between the stepped sleeve and the driven gear, and a second non-return means assembled between the stepped sleeve and the crank axle. A seat has a first gear rotatably provided on the crank axle and having a first end secured in the second non-return means, a second gear secured on the crank axle, a duplicate gear engaged with the first gear and the second gear, and a nose provided on an outer surface of the seat. A force sensor is assembled on an inner wall of the housing and corresponding to the nose.

Abstract: A foldable bicycle has a rear frame having a rear wheel assembled at a rear end thereof and located at a first side thereof. A seat tube is assembled at a front end of the rear frame and has a seat provided at a top thereof. A link tube has a rear end pivotally mounted to a lower end of the seat tube. A front frame is assembled at a front end of the link tube and has a front wheel assembled thereon and located at a first side thereof and in alignment with the rear wheel. A handlebar is pivotally mounted at a top of the front frame. A cushion is assembled between the rear frame and the seat tube.

Abstract: A rear shock assembly for a bicycle has a pair of chain stays, a pair of seat stays, a lever and a shock absorber. The pair of chain stays is pivotally connected to the frame of the bicycle. A rear fork tip is formed on one end of each chain stay. One end of each seat stay is pivotally connected to one of the rear fork tips. The lever is pivotally connected to the frame of the bicycle. The lever has a central connection point, a first end pivotally connected to the pair of seat stays and a second end. The shock absorber is pivotally connected between the second end of the lever and one of the rear fork tips. With such an arrangement, the leverage of the rear shock assembly is reduced and is nearly unity. The force applied to the shock absorber is reduced. The useful life of the shock absorber is prolonged.

Abstract: A bicycle frame that provides a damping capability includes a downtube having a first end and a second end, a seat tube integrally extending from the downtube, a pair of chain stays pivotally connected to the downtube between the ends, a pair of linking rods each having a first arm pivotally connected to the second end of the downtube, a second arm and a third arm, a first damper having a cylinder body pivotally connected to the pair of chain stays and a first piston rod pivotally connected to the pair of linking rods between the first arms, a second damper having a second cylinder body pivotally connected to the seat tube, a second piston rod pivotally connected to the pair of linking rods between the second arms, and a spring disposed between the second cylinder and the second piston rod.

Abstract: The invention discloses a mountain bike frame. In this mountain bike frame, a connection plate is fixed onto one end of the rear fork and is connected to the frame by two rotatable joints and a shock absorber. The main objective of the invention is to provide a mountain bike frame which is able to effectively lower the impact of shocks, to get rid of the phenomena of chain slip and reversal, and is able to reduce the "vibration" by a strong structure.

Abstract: A crank assembly for an electrical bicycle includes a crank axle with two uni-directional bearings respectively and securely mounted to two ends thereof, each one of the uni-directional bearings securely connected to a respective one of two torque members and each of the torque members having an extending portion extending therefrom. Two crank arms are respectively and rotatably mounted to the two base portions. Each one of the crank arms has a recess defined therein so that a distal end of the corresponding extending portion is securely positioned in a periphery defining the recess. A detection device is disposed to each of the two crank arms and is located beside the extending portion corresponding thereto.

Abstract: An electrical drive includes a housing mounted on a crank axle for partially receiving the axle. A driven ratchet base is rotatably mounted on a first end portion of the crank axle and includes a first end portion fixedly engaged with a chain wheel and a second end portion formed with a driven bevel gear. A drive bevel gear meshes with the driven bevel gear for rotating the driven ratchet base. A drive ratchet base is rotatably mounted on a mediate portion of the crank axle and includes a first end portion engaged with the second end portion of the driven ratchet base for rotating the driven ratchet base along one direction only, and a second end portion formed with a first engaging bevel gear. A ring element is fixedly mounted on the mediate portion of the crank axle to rotate therewith, and two pivot axles each extend from an outer wall of the ring element and each have a second engaging bevel gear rotatably mounted and meshing with the first engaging bevel gear.

Abstract: An electrical drive is provided for a bicycle including a crank axle having a first end portion and a second end portion. The electrical drive includes a housing mounted around the crank axle and having a first end portion and a second end portion located adjacent to the first and second end portions of the crank axle respectively. A drive shaft is mounted around the crank axle. A single direction bearing is fitted around the drive shaft. A torsional ring is mounted on the single direction bearing. A torsional rod is movably mounted around the second end portion of the crank axle and driven by the crank axle and is movably mounted in the torsional ring. A sensing race is fixedly mounted around the torsional rod. A sensing unit is mounted on the second end portion of the housing and is located adjacent to the sensing race for sensing a rotational velocity of the crank axle and a torsion exerted on the crank axle by means of the sensing race.