A clutch comprising: a housing rotatable around an axis of rotation; a fixed hub internal to said housing and configured for coupling with a shaft coaxial to said axis of rotation; a movable hub axially mounted along said axis of rotation onto said fixed hub and configured to rotate jointly with said fixed hub ; a plurality of discs interposed between said fixed hub and said movable hub ; wherein said fixed hub and said movable hub are further configured to axially slide, getting farther or closer to each other so as to transmit a variable axial load onto said plurality of discs , thereby selectively transmitting a torque from said housing to said shaft; said clutch further comprising a pressure plate assembly for controlling said variable axial load, said pressure plate assembly including a centrifugal assembly comprising: - a mass holder configured to rotate jointly with said housing ; - a plurality of mass elements radially disposed in said mass holder around said axis of rotation; wherein each mass element comprises a pivot and is configured for a displacement under centrifugal effects by pivoting around said pivot ; wherein said plurality of mass elements , in said displacement under centrifugal effects, are further configured for exerting an axial thrust within said pressure plate assembly , to bring said movable hub closer to said fixed hub , so as to increase said variable axial load; characterized in that each mass element comprises a main body and a column element , said mass element having a center of mass within said main body , said column element connecting said pivot with said main body , said column element being a substantially elongated and upright element, configured for increasing a lever's arm in said displacement under centrifugal effects, said column element defining said pivot radially more external than said center of mass with respect to said axis of rotation. a housing rotatable around an axis of rotation; a fixed hub internal to said housing and configured for coupling with a shaft coaxial to said axis of rotation; a movable hub axially mounted along said axis of rotation onto said fixed hub and configured to rotate jointly with said fixed hub ; a plurality of discs interposed between said fixed hub and said movable hub ; wherein said fixed hub and said movable hub are further configured to axially slide, getting farther or closer to each other so as to transmit a variable axial load onto said plurality of discs , thereby selectively transmitting a torque from said housing to said shaft; said clutch further comprising a pressure plate assembly for controlling said variable axial load, said pressure plate assembly including a centrifugal assembly comprising: - a mass holder configured to rotate jointly with said housing ; - a plurality of mass elements radially disposed in said mass holder around said axis of rotation; - a mass holder configured to rotate jointly with said housing ; - a plurality of mass elements radially disposed in said mass holder around said axis of rotation; wherein each mass element comprises a pivot and is configured for a displacement under centrifugal effects by pivoting around said pivot ; wherein said plurality of mass elements , in said displacement under centrifugal effects, are further configured for exerting an axial thrust within said pressure plate assembly , to bring said movable hub closer to said fixed hub , so as to increase said variable axial load; characterized in that each mass element comprises a main body and a column element , said mass element having a center of mass within said main body , said column element connecting said pivot with said main body , said column element being a substantially elongated and upright element, configured for increasing a lever's arm in said displacement under centrifugal effects, said column element defining said pivot radially more external than said center of mass with respect to said axis of rotation. <EOS>