A procedure for mounting a hub bearing assembly including a rotatable hub, and a bearing unit having a stationary radially outer ring, and two rolling bodies disposed between the radially outer ring and the hub, and executing the steps of hammering a first seal on the hub, mounting a cage on the seal seat, providing the outer ring assembly in axially offset manner relative to the hub, mounting the rolling bodies axially externally from the axially inner side, combining the hub to the outer ring, positioning the outer ring inclination at a predetermined angle, mounting the rolling bodies from the axially inner side, aligning the hub to the radially outer ring, snap insertion of the cage, on rolling bodies from the axially outer side and the cage, on rolling bodies from the axially inner side, hammering a second seal on its seat, from the axially inner side.