An annular hub (11) has flange (2) for connecting to a wheel and
an axial cylindrical surface (14) for mounting a bearing unit (7).
An intermediate annular member (30) is coupled for rotation to a driving
axle shaft (1) by a first toothed/splined coupling (21, 31) and to
the hub (11) by a second toothed/splined coupling (22, 32).
