A bicycle has a front frame portion including a front wheel and handlebars and a rear frame portion including a crank housing, a pedal crank, a rear wheel, and a seat with a flexible fiberglass spring plate removably mounted between upper portions of the front and rear frame portion and a steel cable extending from the crank housing of the rear frame portion to the upper portion of the front frame portion. During operation of the bicycle, the front frame portion can flex with respect to the rear frame portion by flexing the fiberglass spring plate and tensioning the cable against the bias of compression springs holding the cable in tensioned condition. The fiberglass spring plate can be removed and replaced with another plate having different flexibility characteristics for accommodating rider of varying weights.
In a bicycle frame of the type wherein front and rear portions of the frame are connected together by a flexible spring member, the spring includes at least two laterally spaced, elongated rods extending between opposed mounting blocks in the front and rear portions of the frame, with the ends of the rods being held in the mounting blocks by a clamping mechanism that can be released to permit removal and replacement of the spring members when desired. A replaceable wire management tube is attached to the side of the crossbar of the bike by adhesive tape and extends at least a portion of the length of the crossbar. The bicycle frame can incorporate a folding mechanism that permits the front and rear portions of the bike to be folded together for easy portability of the bike.
The present invention relates to the front suspension containing elastic (14) and damping (11) elements, for vehicles with front steerable wheel, such as bicycles, motor-bicycles, motorcycles or tricycles. To minimise the total mass of the unsprung suspension elements, by relocating the elastic and the damping elements to the springing side, the suspension contains at least one cable (10) connected at one end to the upper part of the front wheel fork (1), able to shift in relation to the fork column (6) of the handle bar (7), and at the other end to the elastic element (14) and/or the damping element (11), supported on at least one end by the vehicle frame (8), wherein the cable (10) goes through the handle bar (7) steering axis. The cable (10) is preferably led on at least one leading element (16) supported by the vehicle frame. Optionally, the cable (10) may be connected on the other end to the fork (18) of the vehicle rear suspension.
A folding bicycle is formed with a front frame and a rear frame connected rotatably with one another by a joint and capable of being completely separated and with a suspension system including a flexible element extending between a sprocket mounted on the second frame and the first frame and pretensioned by a spring which is engaged with the joint.
A bicycle frame having a front frame portion with a rearwardly extending crossbar of elliptical cross-section, the major elliptical axis of which is vertically oriented. The rear of the crossbar is gradually tapered by flattening and widening into a substantially equilateral triangular configuration and then sharply reduced to an oblong horizontally extending opening where it is connected to a rear frame by a flexible spring connection.
