Motorcycle with multi-configuration chassis comprising: - a rigid chassis assembly for supporting the engine and the auxiliary fuel feed and mechanical devices; - a rear fork assembly; - a front fork assembly; - a saddle assembly, wherein said multi-configuration chassis comprises hydraulic or electric cylinders adapted to modify their length to allow three adjustments selected from the following: rear fork assembly lengthening,, front fork assembly lengthening, saddle assembly tilt, and said front fork assembly comprises a hydraulic or electric cylinder incorporating in a sliding manner a shock absorber consisting of a cylinder, of a stem and of a spring; said saddle assembly comprises:-a saddle connected to the rigid chassis by means of a hinge with fulcrum;- a rod with variable length comprising a hydraulic or electric cylinder having a first end connected to the rigid chassis assembly by means of a hinge and a second end connected to the saddle by means of a hinge connection, and characterized in that said hydraulic or electric cylinders are adapted to change their length to allow also a fourth type of adjustment by means of a front fork assembly tilt, wherein: said rear fork assembly comprises: - a rigid fork hinged to the rigid chassis assembly in a fulcrum; - a rod with variable length comprising a hydraulic or electric cylinder having a first end connected to the fork by means of a hinge and a second end connected to a rigid body by means of a hinge connection; - a rigid body rotatingly connected to the rigid chassis assembly by means of a hinge; - a rod with variable length forming the rear shock absorber of the motorcycle having a first end connected to the rigid fork by means of a hinge and an arm and a second end connected to the rigid body by means of a hinge connection; said front fork assembly comprises a rigid support body, connected to said rigid chassis assembly by means of a pivot, and a hydraulic or electric cylinder comprising a first end connected to the rigid chassis assembly by means of a hinge and a second end connected to said rigid support body of the front fork assembly by means of a hinge connection. - a rigid chassis assembly for supporting the engine and the auxiliary fuel feed and mechanical devices; - a rear fork assembly; - a front fork assembly; - a saddle assembly, said front fork assembly comprises a hydraulic or electric cylinder incorporating in a sliding manner a shock absorber consisting of a cylinder, of a stem and of a spring; said saddle assembly comprises:-a saddle connected to the rigid chassis by means of a hinge with fulcrum;- a rod with variable length comprising a hydraulic or electric cylinder having a first end connected to the rigid chassis assembly by means of a hinge and a second end connected to the saddle by means of a hinge connection, and characterized in that said hydraulic or electric cylinders are adapted to change their length to allow also a fourth type of adjustment by means of a front fork assembly tilt, wherein: said rear fork assembly comprises: - a rigid fork hinged to the rigid chassis assembly in a fulcrum; - a rod with variable length comprising a hydraulic or electric cylinder having a first end connected to the fork by means of a hinge and a second end connected to a rigid body by means of a hinge connection; - a rigid body rotatingly connected to the rigid chassis assembly by means of a hinge; - a rod with variable length forming the rear shock absorber of the motorcycle having a first end connected to the rigid fork by means of a hinge and an arm and a second end connected to the rigid body by means of a hinge connection; said front fork assembly comprises a rigid support body, connected to said rigid chassis assembly by means of a pivot, and a hydraulic or electric cylinder comprising a first end connected to the rigid chassis assembly by means of a hinge and a second end connected to said rigid support body of the front fork assembly by means of a hinge connection. said rear fork assembly comprises: - a rigid fork hinged to the rigid chassis assembly in a fulcrum; - a rod with variable length comprising a hydraulic or electric cylinder having a first end connected to the fork by means of a hinge and a second end connected to a rigid body by means of a hinge connection; - a rigid body rotatingly connected to the rigid chassis assembly by means of a hinge; - a rod with variable length forming the rear shock absorber of the motorcycle having a first end connected to the rigid fork by means of a hinge and an arm and a second end connected to the rigid body by means of a hinge connection; - a rigid fork hinged to the rigid chassis assembly in a fulcrum; - a rod with variable length comprising a hydraulic or electric cylinder having a first end connected to the fork by means of a hinge and a second end connected to a rigid body by means of a hinge connection; - a rigid body rotatingly connected to the rigid chassis assembly by means of a hinge; - a rod with variable length forming the rear shock absorber of the motorcycle having a first end connected to the rigid fork by means of a hinge and an arm and a second end connected to the rigid body by means of a hinge connection; said front fork assembly comprises a rigid support body, connected to said rigid chassis assembly by means of a pivot, and a hydraulic or electric cylinder comprising a first end connected to the rigid chassis assembly by means of a hinge and a second end connected to said rigid support body of the front fork assembly by means of a hinge connection.