A scooter comprising a frame provided with a footboard and supporting a rear wheel, a steering column equipped with a front wheel and pivotally mounted on said frame, and a motor equipped with a motor shaft driven in rotation about a motor axis and coupled to the rear wheel to drive it in rotation according to a transverse axis via a transmission system, said scooter having a midplane orthogonal to the transverse axis and delimiting opposite first and second lateral sides, and the rear wheel having a first lateral face on said first lateral side and a second lateral face, opposite to the first lateral face, on said second lateral side, wherein the transmission system comprises: - a rear transverse shaft extending along the transverse axis, not parallel to the motor axis, and having two opposite end portions (81, 82), respectively a first end portion and a second end portion, the rear wheel being coupled in rotation to the second end portion of the rear transverse shaft; - a gear system comprising a gear ring meshing with a gear pinion, said gear ring being coupled in rotation to the first end portion of the rear transverse shaft, and said gear pinion being coupled in rotation to the motor shaft, such that a rotation of the motor shaft is convertible by said gear system into a rotation of the rear transverse shaft and the rear wheel about the transverse axis; and - a rear structure supporting at least the first end portion of the rear transverse shaft, said rear structure extending laterally on the second lateral side with respect to the midplane, facing the second lateral face of the rear wheel, such that the second end portion of the rear transverse shaft protrudes from the rear structure; wherein the rear structure comprises two flanges (11, 12), respectively an inner flange and an outer flange, extending facing each other and spaced apart from each other, the inner flange extending at least partly opposite the second lateral face of the rear wheel, said flanges (11, 12) surrounding the gear pinion and the gear ring, and wherein the first end portion of the rear transverse shaft passes through rear orifices formed facing each other in the respective flanges (11, 12); said scooter being characterized in that the rear structure supports the gear pinion and is fastened to the frame, and in that the second end portion of the rear transverse shaft, which protrudes from the rear structure, supports the rear wheel in a cantilever fashion. - a rear transverse shaft extending along the transverse axis, not parallel to the motor axis, and having two opposite end portions (81, 82), respectively a first end portion and a second end portion, the rear wheel being coupled in rotation to the second end portion of the rear transverse shaft; - a gear system comprising a gear ring meshing with a gear pinion, said gear ring being coupled in rotation to the first end portion of the rear transverse shaft, and said gear pinion being coupled in rotation to the motor shaft, such that a rotation of the motor shaft is convertible by said gear system into a rotation of the rear transverse shaft and the rear wheel about the transverse axis; and - a rear structure supporting at least the first end portion of the rear transverse shaft, said rear structure extending laterally on the second lateral side with respect to the midplane, facing the second lateral face of the rear wheel, such that the second end portion of the rear transverse shaft protrudes from the rear structure; wherein the rear structure comprises two flanges (11, 12), respectively an inner flange and an outer flange, extending facing each other and spaced apart from each other, the inner flange extending at least partly opposite the second lateral face of the rear wheel, said flanges (11, 12) surrounding the gear pinion and the gear ring, and wherein the first end portion of the rear transverse shaft passes through rear orifices formed facing each other in the respective flanges (11, 12); said scooter being characterized in that the rear structure supports the gear pinion and is fastened to the frame, and in that the second end portion of the rear transverse shaft, which protrudes from the rear structure, supports the rear wheel in a cantilever fashion.