Wheel assembly for a vehicle, comprising: - a wheel rim suitable to rotate around an axis of rotation (a-a), defining an axial direction (A-A) parallel or coincident with said axis of rotation (a-a), an orthogonal radial direction (R-R), and a circumferential direction locally coincident with a tangential direction (T-T) orthogonal to the axial direction (A-A) and the radial direction (R-R), said wheel rim having a radially outer side, or outer side, opposite the axis of rotation (a-a), and a radially inner side, or inner side, facing the axis of rotation (a-a), said rim being suitable to receive externally a tyre, and wherein said wheel rim forms internally a cylindrical chamber of the rim delimited radially from said inner side; - a motor comprising a rotor and a stator; said rotor being supported, free to rotate, on said stator; said stator being fixed to a stator support; said motor being housed in the said cylindrical wheel rim chamber of said wheel rim; - said rotor being selectively and removably connected rigidly to the inner side of said wheel rim, avoiding the interposition of elastic members or damping members between said rotor and said wheel rim; - said assembly also comprising a braking device, said device comprising a disc brake disc having a radially outer edge and a radially inner edge, said braking device further comprising a disc brake caliper selectively and removably connected, directly or indirectly, to said stator support, said disc brake caliper being placed with its active part astride the inner edge of said disc brake disc; characterized by the fact that - said wheel rim is made in two parts (15, 16) selectively and removably connected to each other to form a wheel rim body, each of said two parts (15, 16) forms an annular holding edge, said opposed edges cooperate with each other, when the two parts are connected to form the wheel rim body, forming in the radially outward direction, a channel for holding the tyre; and wherein - one of the two parts of said wheel rim forms in a single piece at least one spoke that protrudes radially towards the axis of rotation (a-a); and wherein - said disc is connected with its outer edge to said at least one spoke. - a wheel rim suitable to rotate around an axis of rotation (a-a), defining an axial direction (A-A) parallel or coincident with said axis of rotation (a-a), an orthogonal radial direction (R-R), and a circumferential direction locally coincident with a tangential direction (T-T) orthogonal to the axial direction (A-A) and the radial direction (R-R), said wheel rim having a radially outer side, or outer side, opposite the axis of rotation (a-a), and a radially inner side, or inner side, facing the axis of rotation (a-a), said rim being suitable to receive externally a tyre, and wherein said wheel rim forms internally a cylindrical chamber of the rim delimited radially from said inner side; - a motor comprising a rotor and a stator; said rotor being supported, free to rotate, on said stator; said stator being fixed to a stator support; said motor being housed in the said cylindrical wheel rim chamber of said wheel rim; - said rotor being selectively and removably connected rigidly to the inner side of said wheel rim, avoiding the interposition of elastic members or damping members between said rotor and said wheel rim; - said assembly also comprising a braking device, said device comprising a disc brake disc having a radially outer edge and a radially inner edge, said braking device further comprising a disc brake caliper selectively and removably connected, directly or indirectly, to said stator support, said disc brake caliper being placed with its active part astride the inner edge of said disc brake disc; characterized by the fact that - said wheel rim is made in two parts (15, 16) selectively and removably connected to each other to form a wheel rim body, each of said two parts (15, 16) forms an annular holding edge, said opposed edges cooperate with each other, when the two parts are connected to form the wheel rim body, forming in the radially outward direction, a channel for holding the tyre; and wherein - one of the two parts of said wheel rim forms in a single piece at least one spoke that protrudes radially towards the axis of rotation (a-a); and wherein - said disc is connected with its outer edge to said at least one spoke.