High-Drainage Wheel Hub Unit

A wheel hub unit provided with a radially outer ring, which is stationary during use; a radially inner ring, which is rotating during use; at least one row of rolling elements interposed between the radially outer ring and the radially inner ring; and a sealing assembly, which is interposed between the radially outer ring and the radially inner ring. The sealing assembly defines, cooperating with the radially outer ring or with the radially inner ring, a shield of at least one labyrinth seal. The labyrinth seal does not have a circumferential symmetry, but comprises an upper portion and a lower portion with respect to an axis of symmetry (A) of the wheel hub unit and is provided with an angular interruption of the shield formed on its lower portion corresponding to the lower side of the wheel hub unit so as to increase an outflow section thereof from the said labyrinth seal. Thereby, facilitating gravity drainage of contaminants present inside the sealing assembly.