A recumbent bicycle or recumbent tricycle with a removable rear fork that can be swapped with another rear style fork. The rear fork is clamped so that is cannot turn but can be easily swapped. The rear fork can be swapped according to riding conditions or for aesthetics. The rider may use one fork for stiff characteristics, another shock absorbing fork for off-road, or for any style or color at the discretion of the rider, thus allowing greater flexibility. Also, the bicycle includes removable tandem seat for a second rider with a removable pedal assembly for the second rider. In this way the same bicycle can be single or tandem capable. Another feature is a removable pannier rack assembly which adds more choices and capabilities for the rider. These various combinations are highly appealing to the cyclist community.

A foldable bicycle includes a main frame, a front frame, a swingable middle frame, and a rear strut. The main frame includes a front casing, a middle pivoting member, and a rear pivoting member. The front frame is inserted into the front casing. The swingable middle frame includes an upper section, a middle section pivotally connected with the middle pivoting member, and a lower section including a guiding groove. The guiding groove includes first and second groove ends. The distance between the first groove end and the middle pivoting member is greater than that between the second groove end and the middle pivoting member. The rear strut includes a first end pivotally connected to the rear pivoting member and a second end connected to a slider. The slider is slidably received in the guiding groove and capable of being selectively moved between the first and second groove ends.

A foldable bicycle includes a main frame, a front frame, a swingable middle frame, and a rear strut. The main frame includes a front casing, a middle pivoting member, and a rear pivoting member. The front frame is inserted into the front casing. The swingable middle frame includes an upper section, a middle section pivotally connected with the middle pivoting member, and a lower section including a guiding groove. The guiding groove includes first and second groove ends. The distance between the first groove end and the middle pivoting member is greater than that between the second groove end and the middle pivoting member. The rear strut includes a first end pivotally connected to the rear pivoting member and a second end connected to a slider. The slider is slidably received in the guiding groove and capable of being selectively moved between the first and second groove ends.

A pedal-propelled transmission mechanism, applied in a workout equipment; the workout equipment including a deck, a front tube fixed at a front end of the deck, and a handle fixed on a top end of the front tube; the pedal-propelled transmission mechanism comprising a driving chainring having a center axle pivotally connected to a proximity of a rear section of the deck, a left pedal mechanism, and a right pedal mechanism, whereby the structure of the pedal-propelled transmission mechanism is simple that reduces the production cost and time, and easily repair and change when the parts are broken.

A pedal-propelled transmission mechanism, applied in a workout equipment; the workout equipment including a deck, a front tube fixed at a front end of the deck, and a handle fixed on a top end of the front tube; the pedal-propelled transmission mechanism comprising a driving chainring having a center axle pivotally connected to a proximity of a rear section of the deck, a left pedal mechanism, and a right pedal mechanism, whereby the structure of the pedal-propelled transmission mechanism is simple that reduces the production cost and time, and easily repair and change when the parts are broken.

The invention relates to a bicycle (100) having a frame structure (200) that comprises a swingarm structure (225) including a first substantially U-shaped sheet metal part for holding a wheel (103), the frame structure further comprising a frame bridge (219) consisting of a second substantially U-shaped sheet metal part. The first U-shaped sheet metal part is bent substantially in a first bending plane (P) to form a first U-shape, and the second U-shaped sheet metal part is bent in a second bending plane (Q) to form substantially a second U-shape. The first bending plane extends substantially perpendicular to the second bending plane.

The invention relates to a bicycle, with a bicycle seat assembly rotatably connected to the bicycle. Rotation movement of the bicycle seat assembly is possible, seen in the driving direction, to the left and to the right side and is independent of the steering movement of the bicycle. The axis of rotation of the bicycle seat assembly is arranged in front of the axis of the bottom bracket, seen in the driving direction, and the seating surface of the bicycle seat is arranged behind the axis of the bottom bracket, seen in the driving direction. The rotatable bicycle seat assembly enables an upright riding position by dodging the cyclist's leg pedaling downwards through a rotational movement. At the same time it supports the hip side of the other leg. The driver is supported by the bicycle seat even in the upright riding position.

The described bicycle has a frame made of a composite material and defining a monocoque shell which is monolithic, entirely formed of the composite material, and includes: a rear upper portion, a head tube portion, and a rear mounting portion; and first and second side panels each extending between, and integrally formed with, at least the head tube portion at a forward end and the rear upper portion and the rear mounting portion at a rearward end. The first and second side panels are integrally interconnected along their respective top and bottom edges to form a substantially hollow shell structure at least partially enclosing a shell cavity defined between the laterally spaced apart first and second side panels. The hollow shell structure defines a rear opening between the rear upper portion and the rear mounting portion that communicates with the shell cavity.

A sport utility bicycle includes a frame that includes a down tube, a seat tube, and a head tube. The bicycle also includes a detachable accessory bar that mounts between the seat tube and the down tube or the head tube. The detachable accessory bar includes a rear decoupling unit that mounts to the seat tube and a front decoupling unit that mounts to the down tube or the head tube. The detachable accessory bar also includes a bar with a plurality of slots sized to receive straps for securing accessories to the detachable accessory bar.

A sport utility bicycle includes a frame that includes a down tube, a seat tube, and a head tube. The bicycle also includes a detachable accessory bar that mounts between the seat tube and the down tube or the head tube. The detachable accessory bar includes a rear decoupling unit that mounts to the seat tube and a front decoupling unit that mounts to the down tube or the head tube. The detachable accessory bar also includes a bar with a plurality of slots sized to receive straps for securing accessories to the detachable accessory bar.