Disclosed herein is a transmission assembly for a wheeled vehicle. The assembly has a gear box superposed over an existing prior art bicycle. Based on the gear ratios of the gear box, the power input of a rider is increased in the same amount.

Herein described is a bicycle comprising a frame, a drive wheel and a pedal crank/pedal assembly which transmits mechanical energy to the drive wheel by means of a transmission system which comprises: a tank containing a hydraulic fluid; a hydraulic circuit in which the hydraulic fluid flows; a hydraulic pump, actuated by the pedal crank/pedal assembly and configured to pump the hydraulic fluid through the hydraulic circuit; at least one hydraulic actuator, arranged along the hydraulic circuit and configured to transform the hydraulic energy supplied by the hydraulic pump to the hydraulic fluid into mechanical energy; and a drive shaft, connected to the hydraulic actuator and configured to transfer the mechanical energy generated by the hydraulic actuator to the drive wheel. The hydraulic pump is connected to an electric motor whose rotational speed, as well as the operating parameters of the hydraulic pump, are controlled by a circuit board. The bicycle comprises at least one first pedal frequency sensor, which controls the electric motor by modulating its rotational speed, so as to make the hydraulic pump rotate more or less rapidly in order to force the circulation of the hydraulic fluid in the hydraulic circuit, facilitating pedalling, and at least one second power sensor, which measures the power applied by the cyclist to the pedal crank/pedal assembly, so as to accordingly adjust the power supplied by the electric motor to drive the hydraulic pump.

A transportation apparatus (1) comprises a frame (12) having an engagement portion or receiving portion (14) adapted to receive one or more occupant support devices (16); and drive means (20) configured to enable an occupant of the transportation apparatus (1) to power, drive and/or steer the transportation apparatus (1). The drive means (20) has a first configuration or position and a second configuration or position, wherein the drive means (20) is closer to the engagement portion or receiving portion (14) of the frame (12) in the second configuration or position than in the first configuration or position.

An individual chain wheel for a bicycle front crank arrangement for engaging in a drive chain includes a plurality of teeth formed on a circumference of the chain wheel and having a first and a second group of teeth. The teeth of the second group of teeth are arranged in an alternating manner between the teeth of the first group of teeth. Each tooth has a load flank via which force is transmitted between an adjacent roller of the drive chain and the respective tooth. Each tooth of the first group may also have at least one profile with an opening in the vicinity of the flank, in which a portion of an inner link plate of the drive chain, which portion protrudes beyond the roller, engages.

An individual chain wheel for a bicycle front crank arrangement for engaging in a drive chain includes a plurality of teeth formed on a circumference of the chain wheel and having a first and a second group of teeth. The teeth of the second group of teeth are arranged in an alternating manner between the teeth of the first group of teeth. Each tooth has a load flank via which force is transmitted between an adjacent roller of the drive chain and the respective tooth. Each tooth of the first group may also have at least one profile with an opening in the vicinity of the flank, in which a portion of an inner link plate of the drive chain, which portion protrudes beyond the roller, engages.

A bicycle includes a frame, a rear wheel, a suspension system that allows a predetermined relative movement therebetween, and a drivetrain system. The drivetrain system includes a crankset fixed to the frame, a hub and pinion assembly fixed to the rear wheel rotatable about a common pivot axis thereof, and a drive chain placed to connect them directly to each other. The crankset and the hub and pinion assembly are subjected to mutual movement by the action of the suspension system, where at least one among the crankset and the hub and pinion assembly includes a free stroke device that allows both an outbound and inbound free angular stroke of the chain with respect to the respective pivot axes of the crankset and/or of the hub and pinion assembly. The angular stroke is limited by a predetermined angle of entity related to the movement between the wheel and frame.

A bicycle includes a frame, a rear wheel, a suspension system that allows a predetermined relative movement therebetween, and a drivetrain system. The drivetrain system includes a crankset fixed to the frame, a hub and pinion assembly fixed to the rear wheel rotatable about a common pivot axis thereof, and a drive chain placed to connect them directly to each other. The crankset and the hub and pinion assembly are subjected to mutual movement by the action of the suspension system, where at least one among the crankset and the hub and pinion assembly includes a free stroke device that allows both an outbound and inbound free angular stroke of the chain with respect to the respective pivot axes of the crankset and/or of the hub and pinion assembly. The angular stroke is limited by a predetermined angle of entity related to the movement between the wheel and frame.

A pedal unit attachable/detachable training bicycle that easily attach/detach a chain and a pedal unit to/from a training bicycle that has a seat stay. The pedal unit attachable/detachable training bicycle includes a bicycle frame having a receiving member provided at bottom of a seat tube to connect a pedal unit. The pedal unit, which is configured to detachably attach to the receiving member. A chain threaded between the pedal unit and a rear wheel. The bicycle frame is configured to enable a seat stay on side of the chain wheel to be freely attached to and detached from the bicycle frame.

An electric bicycle includes a bicycle body, a pedal shaft rotatably installed on a pedal shaft support of the bicycle body, a driving sprocket rotatably installed on the pedal shaft, and a clutch device configured to connect the pedal shaft and the driving sprocket to enable power transmission or release the connection between the pedal shaft and the driving sprocket.

A pedal driven cycle comprising a belt drive connecting a power input sprocket to a driven sprocket along a chain line; an outer protective belt drive cover plate having a footprint which substantially coincides with a side profile of the belt drive along at least a major portion of its length of travel so that the outer cover plate does not extend beyond an outer surface of the belt drive; and fixtures for mounting the outer protective belt drive cover plate to the cycle in parallel with the chain line and laterally spaced apart from a side edge of the belt drive to provide a clearance, with fore and aft adjustment.