Abstract: A seat for fastening the curved tube of a bicycle V-type brake is composed of two connection members, a seat body, and a torsion spring. The connection members are fastened pivotally and coaxially with a first brake arm of the bicycle V-type brake by a first pivot. The seat body is fastened pivotally with the connection members by a second pivot and is provided with a first retaining portion. The seat body has an end plate, which is fastened with one end of the curved tube. The torsion spring is fitted over the second pivot such that one end of the torsion spring urges the first pivot, and that another end of the torsion spring urges the first retaining portion of the seat body. When the brake cable is triggered, the first brake arm and the second brake arm are actuated to cause the brake shoes to make contact with the wheel rim. In the meantime, the seat body is caused to swivel by a reaction force which is brought about by the brake cable and is greater than the torsional force of the torsion spring.

Abstract: An adjustable bicycle brake comprises two brake arms, two brake shoes fastened respectively with the brake arms, and one tension spring. The brake arms are fastened pivotally and symmetrically with a bicycle frame and are provided respectively with a stopping block. The tension spring is fastened at both ends thereof with the brake arms and is provided with two pushing blocks urging the stopping blocks of the brake arms. The pushing blocks can be displaced to bring about the displacements of the brake arms so as to adjust the brake shoes to be separated equidistantly from the bicycle wheel.

Abstract: An improved assembled structure of a handlebar stem assembly and a fork of a bicycle wherein a handlebar stem assembly is inserted into a steer tube; the handlebar stem of the handlebar stem assembly is provided with a step which abuts against a pressure adjuster on a top end of the steer tube such that the pressure adjuster exerts a downward force to secure the upper bearing assembly in place; by relative movement between the cooperative tapered contact surfaces of the handlebar stem and tongue-shaped tube placed below the handlebar stem, the outer sides of the handlebar stem and the tongue-shaped tube abut against the inner wall of said steer tube in order to secure said handlebar stem to steer tube and obtain axial and radial positioning of the handlebar stem. The handlebar stem can be provided with external threads rather than a step for being engaged with a locking nut which acts as a step for abutting against the pressure adjuster.

Abstract: An adjusting device assembly for making, a manual adjustment of a bicycle head bowl bearing comprises a front fork upright tube inserted into a head tube in which a bearing bowl is received. A bearing is received in the bearing bowl and can be located securely by an inner ring, which can be forced to move downwards by a locating ring which is in turn caused to move downwards by a clamping ring capable of being caused to move downwards by an adjustment bolt which can be fastened manually.