Wheel and wheel disk

A wheel assembly comprising:

• a wheel rim having an internal surface facing a wheel rotational axis, the wheel rim comprising at least a first external portion in the form of a first flange at an outer side of the wheel rim and at least a second portion in the form of a second flange at an opposite inner side of the wheel rim, the first and second flanges being associated to an intermediate portion provided with at least one bed-shaped shoulder having a disk-contacting surface an entire length of which is sloped at a positive non-zero angle relative to the wheel rotational axis such that the entire length of the disk-contacting surface continuously increases in diameter in a direction from the outer side to the inner side of the wheel rim;
• and
• a wheel disk having a first portion to be attached to a wheel hub, a second portion including a plurality of spokes that define ventilation windows, and a third portion including a circular peripheral flange having a rim-contacting surface in contact with the disk-contacting surface of the wheel rim, the circular peripheral flange having a width, an entire length of the rim-contacting surface of the circular peripheral flange extending at a positive angle relative to the wheel rotational axis that corresponds to the angle of the disk-contacting surface of the bed-shaped shoulder relative to the wheel rotational axis, and wherein the ventilation windows comprise non-circular openings with an external edge defined by the circular peripheral flange and at least two side edges defined by adjacent spokes wherein each spoke includes a central surface between two adjacent ventilation windows and fillets that slope from the central surface to respective side edges of the adjacent ventilation windows,
• the wheel disk and the wheel rim being associated with each other by the association between the peripheral circular flange of the disk and the bed-shaped shoulder of the intermediate portion of the rim.