In a bearing assembly particularly for wheel bearings comprising an inner ring having at least one radially outwardly directed fastening flange, an outer ring and a plurality of rolling elements in the annular space between the rings, a cap secured to the inner ring having a radial section extending between the outer ring and fastening flange and a seal ring fastened to the outer ring which slides on the cap, means defining at least one space between the radial cap section and the fastening flange of said inner ring, said space being filled at least partly with means which inhibits heat transfer from the inner ring to the cap.