A bicycle frame includes a top tube provided with bulge-processed regions at its front and rear end portions, formed with bores having axes which intersect a longitudinal axis of the top tube, for accommodating therein the upper end portions of the head tube and the seat tube, respectively. The frame further includes a down tube provided with a bulge-processed region at its front end portion, formed with a bore having an axis which intersects a longitudinal axis of the down tube, for accommodati...

A bicycle frame includes a top support tube extending rearwardly to a welded connection with a rear fork structure. The rear fork structure has another welded connection with an upstanding seat tube. Aligned holes are formed in the top support tube so that the seat tube can extend downwardly through the openings; the seat tube is welded to the top support tube at the aligned openings. The various tubes are arranged and proportioned to provide a welded triangular reinforcement designed to diffuse...

A bicycle crossbar for attachment between a head tube and seat tube of a bicycle and for providing cable concealment and increased structural integrity to the resultant bicycle frame. The crossbar comprises an elongate, rigid tubular member having a groove formed within and extending longitudinally along the side wall thereof which is sized and configured to accommodate three cables of the bicycle. The crossbar is formed in a manner wherein the side wall, including the groove formed therein, is ...

A cable installation aiding device is used to aid in the installation of cable members (e.g., brake cables or the like) in a steerer tube of a bicycle. The cable installation aiding device has an attachment part and a first cable guide part. The attachment part is preferably attached to the inner circumferential surface of the steerer tube. The first cable guide part is configured and dimensioned to guide cable members passing through the steerer tube between a first axial end of the steerer tub...

A seat tube for a bicycle includes an upright tube, a head and an inner tube all of which are made of fiber reinforced material. The upright tube has an inserting portion at a top thereof. The head has an inside chamber and a sleeve portion at a bottom thereof. The sleeve portion of the head is sleeved onto the inserting portion of the upright tube such that the inside chamber of the head is communicated with an inside of the upright tube. An outer wall of the inserting portion of the upright tu...

A rear frame for a bicycle is disclosed to include two tubes and a connecting portion. The tubes are respectively made of fiber reinforced material and have at least one rib therein. The connecting portion is connected between the tubes. By means of the aforesaid arrangement, the rear frame has a high mechanical strength and light weight.

A bicycle frame has a hinge joint in the column for the handle bars, arranged so that the column is folded to cause the handlebars to be near the pedals, whereby the bicycle is compact for storage and transport.

In a bicycle frame adapted for internal control cabling, the top and down tubes are fixed to parallel plates. The parallel plates are fixed to the head tube spacing the top and down tubes apart from the head tube allowing control cables to be routed internally through the steering tube of a front wheel fork, continuing between the parallel plates and through the top and down tubes. Handlebars and a bottom bracket housing are also provided assisting the internal routing of the cable.

A tube connection assembly of a bicycle frame includes a bi-forked portion formed by a hollow rectangular tube; one end of the rectangular tube being bi-forked as two halves; each half having a positioning groove; and a combining portion formed by two plates which are connected as a shape corresponding to that of the positioning groove and the bi-forked portion so that in assembly the combining portion is assembled to the bi-forked portion; and connection area of the bi-forked portion and combin...

A bicycle including a frame having a main frame portion and an articulating frame portion pivotally mounted to the main frame portion and carrying a rear wheel of the bicycle. A shock absorber preferably is operably connected between the main frame portion and the articulating frame portion. Preferably, the top tube and down tube of the main frame contact one another for a distance extending rearwardly from the head tube of the main frame. In one arrangement, the down tube has a non-circular cro...