Pedal-assisted bicycle with rear suspension and related compensating device of the travel of said suspension

Pedal-assisted bicycle comprising a frame, a rear wheel, a suspension system of the rear wheel relative to the frame which allows a predetermined relative displacement between them, a motion drive system from a crankset to the rear wheel, wherein the drive system comprises a crankset fixed to the frame, a hub and pinion assembly fixed to the rear wheel, and a drive chain positioned to connect them directly to each other, wherein the crankset and the hub and pinion assembly are subject to reciprocal displacement by the action of the suspension system, where the crankset comprises:

• a gear wheel engaged by said chain
• a muscle torque drive shaft, to which the crankarms are coupled and referred to hereafter as the muscle shaft;
• and
• a drive unit equipped with an electric motor, and an electric torque drive shaft, referred to hereafter as a drive shaft;
• wherein the crankset comprises:
• a freewheel device operatively interposed between the drive and muscle shafts;
• a compensating device operatively interposed between the drive shaft and the gear wheel, wherein said device is configured to generate between the two an angular forward compensation stroke between a rest position corresponding to an absence of chain pull, and a compensation position, corresponding to a chain pull action, wherein said forward compensation stroke is limited to a predetermined angle and is opposite to the free stroke of the freewheel device.