A supporting and braking assembly for a motor vehicle wheel, the assembly comprising: - a supporting member, defined by a single piece comprising: a) a central portion; b) an attachment portion which extends from said central portion and is adapted to be coupled to a suspension of the motor vehicle; c) two arms (15,16) which extend in cantilevered manner from said central portion in essentially radial directions; - a hub adapted to support said wheel and coupled to said central portion by means of bearing means to turn about a rotation axis; - a floating caliper braking device comprising: a) a brake disc, fixed and coaxial with respect to said hub; b) a floating caliper arranged straddling said brake disc and slidingly coupled to an upper stud and to a lower stud, which are parallel to said rotation axis and are directly fixed, each, to the end of a respective said arm (15,16); c) two brake pads (21,22) arranged on opposite sides of said brake disc and coupled to said floating caliper; characterized in that: - said brake pads (21,22) are supported only by said floating caliper; - one of said upper and lower stud is sized so as to have a larger outer diameter than the one of the other stud, to transfer the tangential loads caused by braking from said floating caliper directly onto the corresponding arm. - a supporting member, defined by a single piece comprising: a) a central portion; b) an attachment portion which extends from said central portion and is adapted to be coupled to a suspension of the motor vehicle; c) two arms (15,16) which extend in cantilevered manner from said central portion in essentially radial directions; a) a central portion; b) an attachment portion which extends from said central portion and is adapted to be coupled to a suspension of the motor vehicle; c) two arms (15,16) which extend in cantilevered manner from said central portion in essentially radial directions; - a hub adapted to support said wheel and coupled to said central portion by means of bearing means to turn about a rotation axis; - a floating caliper braking device comprising: a) a brake disc, fixed and coaxial with respect to said hub; b) a floating caliper arranged straddling said brake disc and slidingly coupled to an upper stud and to a lower stud, which are parallel to said rotation axis and are directly fixed, each, to the end of a respective said arm (15,16); c) two brake pads (21,22) arranged on opposite sides of said brake disc and coupled to said floating caliper; a) a brake disc, fixed and coaxial with respect to said hub; b) a floating caliper arranged straddling said brake disc and slidingly coupled to an upper stud and to a lower stud, which are parallel to said rotation axis and are directly fixed, each, to the end of a respective said arm (15,16); c) two brake pads (21,22) arranged on opposite sides of said brake disc and coupled to said floating caliper; - said brake pads (21,22) are supported only by said floating caliper; - one of said upper and lower stud is sized so as to have a larger outer diameter than the one of the other stud, to transfer the tangential loads caused by braking from said floating caliper directly onto the corresponding arm.