Three-wheeled motor vehicle comprising: a forecarriage comprising: - a forecarriage frame, - a pair of front wheels (10', 10") kinematically connected to the forecarriage frame by means of an articulated quadrilateral, said articulated quadrilateral comprising a pair of cross members (24', 24"), hinged to the forecarriage frame in correspondence of median hinges, said cross members (24', 24") being connected together, at opposite transversal ends (40, 44), by means of uprights (48', 48") pivoted at said transversal ends (40, 44) at lateral hinges, each upright (48', 48") extending from an upper end and a lower end, the upper end facing the upper cross member and the lower end facing the lower cross member (24"), the cross members (24', 24") and the uprights (48', 48") defining said articulated quadrilateral, wherein the forecarriage further comprises a steering bar mechanically associated with handlebars, wherein the steering bar extends between opposite lateral ends (71,72) at which it is mechanically connected to wheel support elements (73,74) of each wheel (10', 10") joined to the uprights (48',48"), so as to control the rotation of said front wheels (10', 10") around respective steering axes (S'-S', S"-S"), wherein at said lateral ends (71,72), the steering bar is mechanically connected to each wheel support element (73, 74) by means of a first and a second roll hinge (75,76), and by means of a first and a second steering hinge (77,78) respectively perpendicular to said first and second roll hinges (75,76), wherein the roll hinges (75,76) are parallel to said median hinges and placed at a distance from each other equal to the distance between the lateral hinges of each cross member (24', 24") and are aligned with the lateral hinges along the uprights (48', 48"), characterised in that, in conditions of the front wheels (10', 10") being straight and parallel to the forward direction, the first and second steering hinges (77,78) are arranged offset from the cross members (24', 24") in the longitudinal direction (X-X) such that, with respect to a projection plane parallel to the ground, the straight lines (F, G) joining the steering axes (S'-S', S"-S") with the first and second steering hinges (77,78) intersect at a point of contact of the rear wheel with the ground, passing through a centreline plane (M-M) of the vehicle. a forecarriage comprising: - a forecarriage frame, - a pair of front wheels (10', 10") kinematically connected to the forecarriage frame by means of an articulated quadrilateral, - a forecarriage frame, - a pair of front wheels (10', 10") kinematically connected to the forecarriage frame by means of an articulated quadrilateral, said articulated quadrilateral comprising a pair of cross members (24', 24"), hinged to the forecarriage frame in correspondence of median hinges, said cross members (24', 24") being connected together, at opposite transversal ends (40, 44), by means of uprights (48', 48") pivoted at said transversal ends (40, 44) at lateral hinges, each upright (48', 48") extending from an upper end and a lower end, the upper end facing the upper cross member and the lower end facing the lower cross member (24"), the cross members (24', 24") and the uprights (48', 48") defining said articulated quadrilateral, wherein the forecarriage further comprises a steering bar mechanically associated with handlebars, wherein the steering bar extends between opposite lateral ends (71,72) at which it is mechanically connected to wheel support elements (73,74) of each wheel (10', 10") joined to the uprights (48',48"), so as to control the rotation of said front wheels (10', 10") around respective steering axes (S'-S', S"-S"), wherein at said lateral ends (71,72), the steering bar is mechanically connected to each wheel support element (73, 74) by means of a first and a second roll hinge (75,76), and by means of a first and a second steering hinge (77,78) respectively perpendicular to said first and second roll hinges (75,76), wherein the roll hinges (75,76) are parallel to said median hinges and placed at a distance from each other equal to the distance between the lateral hinges of each cross member (24', 24") and are aligned with the lateral hinges along the uprights (48', 48"), characterised in that, in conditions of the front wheels (10', 10") being straight and parallel to the forward direction, the first and second steering hinges (77,78) are arranged offset from the cross members (24', 24") in the longitudinal direction (X-X) such that, with respect to a projection plane parallel to the ground, the straight lines (F, G) joining the steering axes (S'-S', S"-S") with the first and second steering hinges (77,78) intersect at a point of contact of the rear wheel with the ground, passing through a centreline plane (M-M) of the vehicle.