Abstract: A rolling bearing assembly comprises a bearing including a rotating ring and a stationary ring, a sleeve in which the stationary ring of the bearing is mounted, a housing in which the sleeve is mounted, a shaft with which the rotating ring of the bearing is coupled in rotation with respect to the housing and a sensor unit including an impulse ring coupled in rotation to the rotating ring and a sensing unit comprising at least one sensing element mounted in a sensor body. The sleeve, on the one hand, supports both the stationary ring of the bearing and the sensor body and, on the other hand, compensates thermal dilatations between the housing and the stationary ring.