Abstract: A bicycle seat adjustment assembly includes a fixing member connected to a seat and a lever pivotably connected to the fixing member. An outer tube is connected to a bicycle frame and an inner tube is located in the outer tube. The inner tube is connected to the fixing member. A cylinder is located within the outer tube and the inner tube. The inner tube is connected to the fixing member. A piston rod of the cylinder is connected to the fixing member and is operated by the lever. The cylinder has an end fixed to the outer tube. A sleeve is located at the bottom end of the inner tube, and another sleeve is located between the inner tube and a reception portion of the outer tube to guide movement of the inner tube relative to the outer tube and cylinder.

Abstract: A shifting structure for a bicycle is fixed on a handlebar of a bicycle to control a bicycle device and contains a clamping assembly, a rotary shift set, a height adjusting assembly, and a tightness adjusting set. The clamping assembly includes a first retainer, a second retainer, two hollow engaging portions, and a positioning bolt. The rotary shift set includes a rotating seat and a rotation member. The height adjusting assembly includes two retaining portions, each having a central axis line for matching with a central axis line of each engaging portion so that an angle ? is defined between the central axis line of each retaining portion and the central axis line of each engaging portion. The rotating seat has an abutting post, the tightness adjusting set includes a screwing element, a rotatable button, a fitting member, and a steel rope.

Abstract: A shock-absorbing device includes a first cylinder with a first room defined therein and a room is defined in an end of the first cylinder. A second cylinder extends into the first cylinder and has a first piston so as to define a third room and a third room. Hydraulic liquid is filled in the second and third rooms. A first tube and a second tube extending through the first tube are located in the first room. A first path and a second path communicate with the recess. The first and second tubes extend into the second cylinder and are connected to the first piston. When the first and second cylinders are relative moved, the hydraulic liquid is controlled to flow or not flow between the first and second paths so as to absorb different levels of shocks, and the speed that the shock-absorbing device returns can be adjusted.

Abstract: A seat adjustment device for a bike includes a holding base adapted to be engaged on a top of a support tube for a seat. First and second clamp blocks are received in the holding base. The second clamp block is moveable relative to the first clamp block. A bar-clamping space is formed between the first and second clamp blocks to clamp a support rod for the seat. An resilient member is provided between the first and second clamp blocks to bias the first and second clamp blocks towards an inner wall of the holding base. The first and second clamp blocks may be free to pivot around in the holding base, allowing the seat to be adjusted at a significantly increasing angle.

Abstract: A bicycle seat adjustable assembly includes a fixing member connected to a seat and a lever is pivotably connected to the fixing member. An outer tube is connected between a bicycle frame and an inner tube is located in the outer tube. The inner tube is connected to the fixing member. A cylinder is located between the outer tube and the inner tube. The inner tube is connected to the fixing member. A piston rod of the cylinder is connected to the fixing member and is operated by the lever. The cylinder has an end fixed to the outer tube. A sleeve is located at the bottom end of the inner tube, and another sleeve is located between the inner tube and a reception portion of the outer tube so as to guide and the cylinder and the inner tube.

Abstract: A shock-absorbing device includes a first cylinder with a first room defined therein and a room is defined in an end of the first cylinder. A second cylinder extends into the first cylinder and has a first piston so as to define a third room and a third room. Hydraulic liquid is filled in the second and third rooms. A first tube and a second tube extending through the first tube are located in the first room. A first path and a second path communicate with the recess. The first and second tubes extend into the second cylinder and are connected to the first piston. When the first and second cylinders are relative moved, the hydraulic liquid is controlled to flow or not flow between the first and second paths so as to absorb different levels of shocks, and the speed that the shock-absorbing device returns can be adjusted.

Abstract: A bicycle seat includes two parts and a spring member is connected between the two respective rear ends of the first and second parts. A first fixing member is fixed to an underside of the spring member. A second fixing member is connected across the two respective front ends of the first and second parts respectively. A frame includes a closed end, a first distal end and a second distal end, the closed end is inserted into the reception recess of the second fixing member. The two distal ends of the frame are connected to the two ends of the first fixing member. The two parts are individually deformed when the cyclist changes his/her poses.