Abstract: The registering front faces of the two portions (8, 9) of the outer race comprise each at least two precision-machined axial projections forming together a radial reference surface. In each portion the projections are separated by axial recesses each adapted to be engaged by a corresponding axial projection of the other portion so that after a relative rotation of the two portions of the outer race the rolling elements (19) of the second row can easily be fitted in position, the bearing being completed by encompassing the joint plane formed between the two portions with an annular seal, for example in the form of a rubber flat ring. Thus, the permissible bearing load is increased since the two rows (18, 19) of rolling elements have the same number of such rolling elements.