Power train for a pedal vehicle comprising: - a crankset shaft arranged in such a way as to rotate about a first axis of rotation, - a main output plate arranged to drive an output transmission chain or belt, - a first motor, - a second motor, - an epicyclic gear train comprising a first input element, an output element and a sun gear, the crankset shaft and the second motor being connected to the epicyclic gear train via the first input element in such a way as to form a first input of the epicyclic gear train, the first motor being connected to the epicyclic gear train via the sun gear in such a way as to form a second input of the epicyclic gear train, the output element connecting the epicyclic gear train to the main output plate in such a way as to form an output of the epicyclic gear train, wherein the main output plate, the first input element, the output element and the sun gear are arranged in such a way as to rotate about the same second axis of rotation different from the first axis of rotation, wherein the main output plate is integral with the output element, characterised in that the power train comprises: - a secondary output plate arranged to rotate about the first axis of rotation and meshed on the output transmission chain or belt, - a first freewheel arranged to prevent the secondary output plate from rotating slower than the crankset shaft when the crankset shaft rotates in the normal direction of pedalling, - a speed reduction gear system retaining the direction of rotation to transmit a rotation between the crankset shaft and the first input element. - a crankset shaft arranged in such a way as to rotate about a first axis of rotation, - a main output plate arranged to drive an output transmission chain or belt, - a first motor, - a second motor, - an epicyclic gear train comprising a first input element, an output element and a sun gear, the crankset shaft and the second motor being connected to the epicyclic gear train via the first input element in such a way as to form a first input of the epicyclic gear train, the first motor being connected to the epicyclic gear train via the sun gear in such a way as to form a second input of the epicyclic gear train, the output element connecting the epicyclic gear train to the main output plate in such a way as to form an output of the epicyclic gear train, wherein the main output plate, the first input element, the output element and the sun gear are arranged in such a way as to rotate about the same second axis of rotation different from the first axis of rotation, wherein the main output plate is integral with the output element, characterised in that the power train comprises: - a secondary output plate arranged to rotate about the first axis of rotation and meshed on the output transmission chain or belt, - a first freewheel arranged to prevent the secondary output plate from rotating slower than the crankset shaft when the crankset shaft rotates in the normal direction of pedalling, - a speed reduction gear system retaining the direction of rotation to transmit a rotation between the crankset shaft and the first input element. the crankset shaft and the second motor being connected to the epicyclic gear train via the first input element in such a way as to form a first input of the epicyclic gear train, the first motor being connected to the epicyclic gear train via the sun gear in such a way as to form a second input of the epicyclic gear train, the output element connecting the epicyclic gear train to the main output plate in such a way as to form an output of the epicyclic gear train, wherein the main output plate, the first input element, the output element and the sun gear are arranged in such a way as to rotate about the same second axis of rotation different from the first axis of rotation, wherein the main output plate is integral with the output element, characterised in that the power train comprises: - a secondary output plate arranged to rotate about the first axis of rotation and meshed on the output transmission chain or belt, - a first freewheel arranged to prevent the secondary output plate from rotating slower than the crankset shaft when the crankset shaft rotates in the normal direction of pedalling, - a speed reduction gear system retaining the direction of rotation to transmit a rotation between the crankset shaft and the first input element. - a secondary output plate arranged to rotate about the first axis of rotation and meshed on the output transmission chain or belt, - a first freewheel arranged to prevent the secondary output plate from rotating slower than the crankset shaft when the crankset shaft rotates in the normal direction of pedalling, - a speed reduction gear system retaining the direction of rotation to transmit a rotation between the crankset shaft and the first input element.