Abstract: An axle assembly includes a first holding member, and a second holding member with a collet shape on a tubular body. The second holding member is inserted into a penetrating hole of a shaft mounting portion so as to reduce its diameter. The tubular body is directly inserted into the penetrating hole. When moving the fastening bar by operation of the cam lever, both holding members nip and hold the shaft mounting portion. While dismantling, a diameter shrinking part moves so as to reduce a diameter of the second holding member.

Abstract: A fixed member is non-rotatably attached to a suspension fork, and a rotatably installed movable member is attached to the fixed member so as to be operable in the up-down direction. An index mechanism enables the state of the movable member to be selected from either a state in which the movable member is movable in the up-down direction or a state in which the movable member is not movable in the up-down direction. The index mechanism is adapted so that, in the middle of the states, it cannot hold the relative positional relationship between the fixed member and the movable member. The suspension fork for a bicycle is inexpensive, easy to produce, and has a reliable lock function.

Abstract: An axle assembly is supplied capable of solving that troublesome mounting and dismantling works needing a wrench to screw fasten bolt. In the axle assembly, the present invention is to furnish nipping and holding member with collet shape on tubular body; to insert the nipping and holding member into penetrating hole of shaft mounting portion so as to shrink diameter; and to directly insert the tubular body into the penetrating hole. When moving fastening bar by operation of cam lever, both nipping and holding members nip and hold the shaft mounting portion. While dismantling, diameter shrinking part moves so as to make the nipping and holding member shrink diameter.

Abstract: A hydraulic suspension unit which is arranged in a supporting pipe has a piston arranged in a cylinder and a piston rod which is coupled with the piston and projected from the cylinder and detachably coupled with a slide pipe edge portion. Coil springs for buffering are further built in the cylinder. Thus, the hydraulic suspension unit can be easily exchanged.