Abstract: A clutch release bearing assembly comprising a clutch release bearing having inner and outer races with rolling elements therebetween, the inner race being carried on a bearing carrier which is slidably mounted on a drive element of the clutch and is engaged by a clutch control member whereby a clutch disengaging force is applied to the inner race and transmitted therefrom by the rolling elements, to the outer race and hence to the clutch mechanism the bearing carrier including a metal insert and a synthetic plastics part, the metal insert comprising a tubular portion and a flange portion, the tubular portion having on its external surface a seat portion which is adapted to engage and retain the inner race of the bearing and the bore of the tubular portion being adapted to surround a drive element of the clutch, the flange portion being adapted to provide a transverse abutment surface for engagement by the clutch operating means, the plastics part being moulded onto the insert so that relative movement betwee