Continuously variable transmission device for a two-, three- or four-wheel motorcycle, connectable to a drive shaft, comprising: - a drive pulley rotatable about a rotation axis, comprising a first half-pulley carrying a first active surface and a second half-pulley carrying a second active surface, a V-belt being arranged between said active surfaces (8a,10a); - a speed regulator comprising a container, provided with a seat having a bottom surface, and special rollers provided with engagement means, movable by centrifugal action on said bottom surface, moving radially and axially with respect to this and thus imposing an axial sliding to said first half-pulley; - a gear shift regulation device suitable to operate on said rollers through an axial action adjustable independently of the number of engine revolutions, to influence the centrifugal movement of the rollers and so influence the gear shift, wherein said gear shift regulation device comprises an abutment element facing the seat of the container, in such a way that the rollers are axially arranged between said abutment element and the bottom surface of the seat, and axial action means suitable to exert on the element abutment an axial action of adjustable intensity; characterised in that in a first configuration wherein the gear shift regulation device is off, the axial action means are configured so as not to transmit to the abutment element any axial load drawing the abutment element towards the bottom surface, and in a further configuration wherein the gear shift regulation device is switched on, the axial action means transmit to the abutment element an axial load moving the abutment element towards the bottom surface. - a drive pulley rotatable about a rotation axis, comprising a first half-pulley carrying a first active surface and a second half-pulley carrying a second active surface, a V-belt being arranged between said active surfaces (8a,10a); - a speed regulator comprising a container, provided with a seat having a bottom surface, and special rollers provided with engagement means, movable by centrifugal action on said bottom surface, moving radially and axially with respect to this and thus imposing an axial sliding to said first half-pulley; - a gear shift regulation device suitable to operate on said rollers through an axial action adjustable independently of the number of engine revolutions, to influence the centrifugal movement of the rollers and so influence the gear shift, wherein said gear shift regulation device comprises an abutment element facing the seat of the container, in such a way that the rollers are axially arranged between said abutment element and the bottom surface of the seat, and axial action means suitable to exert on the element abutment an axial action of adjustable intensity; characterised in that in a first configuration wherein the gear shift regulation device is off, the axial action means are configured so as not to transmit to the abutment element any axial load drawing the abutment element towards the bottom surface, and in a further configuration wherein the gear shift regulation device is switched on, the axial action means transmit to the abutment element an axial load moving the abutment element towards the bottom surface.