Wheel having a curvature radius, comprising: - at least one supporting frame, including at least one central portion having a center around which said wheel can turn, and at least one plurality of radial portions, extending from said central portion angularly displaced with each other, at least one housing seat being delimited between two adjacent radial portions; - at least one movable element, housed in a respective housing seat and radially displaceable between a first working position, wherein it is located at a maximum distance with respect to said center, and a second working position, wherein is located at a minimum distance with respect to said center of said at least one central portion, said at least one plurality of radial portions and said at least one movable element having respective distal sections (222, 51), with respect to said center, curved with a curvature radius corresponding to the curvature radius of said wheel and being flush with each other, when said at least one movable element is located in said first working position, thereby delimiting a circular perimeter of said wheel; - at least one locking element for said at least one movable element, displaceable between one locking position, wherein it abuts on said at least one movable element and prevents the radial displacement thereof, and one unlocking position, wherein it allows the radial displacement of said at least one movable element toward said second working position; - at least one returning element of said at least one movable element, comprised between said supporting frame and said at least one movable element, said at least one returning element being configured to bring said at least one movable element back into said first working position; and - at least one band made of an elastically deformable material, surrounding said distal sections (222, 51) of said at least one plurality of radial portions and said at least one movable element, at said circular perimeter of said wheel. - at least one supporting frame, including at least one central portion having a center around which said wheel can turn, and at least one plurality of radial portions, extending from said central portion angularly displaced with each other, at least one housing seat being delimited between two adjacent radial portions; - at least one movable element, housed in a respective housing seat and radially displaceable between a first working position, wherein it is located at a maximum distance with respect to said center, and a second working position, wherein is located at a minimum distance with respect to said center of said at least one central portion, said at least one plurality of radial portions and said at least one movable element having respective distal sections (222, 51), with respect to said center, curved with a curvature radius corresponding to the curvature radius of said wheel and being flush with each other, when said at least one movable element is located in said first working position, thereby delimiting a circular perimeter of said wheel; - at least one locking element for said at least one movable element, displaceable between one locking position, wherein it abuts on said at least one movable element and prevents the radial displacement thereof, and one unlocking position, wherein it allows the radial displacement of said at least one movable element toward said second working position; - at least one returning element of said at least one movable element, comprised between said supporting frame and said at least one movable element, said at least one returning element being configured to bring said at least one movable element back into said first working position; and - at least one band made of an elastically deformable material, surrounding said distal sections (222, 51) of said at least one plurality of radial portions and said at least one movable element, at said circular perimeter of said wheel.