Suspension group (4) for motorised vehicles comprising a main spring (16) which extends between a first and a second end (20, 24) of the group (4), a main damper (40) connected in parallel to said main spring (16) said main spring (16) being pre-loaded by pre-loading means which together press the spring (16) in compression and impose a rest length thereon (Lo), namely the length assumed by the spring (16) when there are no further external loads on the first and/or on the second end (20, 24) of the group (4) except for the pre-load caused by the pre-loading means, wherein the first and second end (20, 24) are connected kinematically to a first and a second mass (28, 32) of the motor vehicle respectively. Between at least one of said first and second ends (20, 24) and the respective suspended/non-suspended mass (28, 32) at least one kinematism (44) is placed, in series with the main spring (16) which permits a supplementary stroke (S) between the end (20, 24) to which it is attached and the relative adjacent suspended/non-suspended mass (28, 32), said supplementary stroke (S) increasing the distance between the suspended and non-suspended mass (28, 32) imposed by the extension of the main spring (16), providing a supplementary stroke (S), after the main spring (16) has extended reaching its rest length (Lo).