Abstract: An improved self-contained roller bearing assembly includes coaxially disposed inner and outer bearing race members (or assemblies), at least one circumferential row of cylindrical rollers and at least one circumferential row of tapered rollers disposed radially between the inner and outer bearing members (or assemblies). The inner and outer bearing race members (or assemblies) include generally recessed and generally non-recessed annular cylindrical raceway surfaces, as well as generally recessed and generally non-recessed annular conical raceway surfaces. At least one of the inner and outer bearing race members or assemblies includes at least a pair of separate race member portions that may optionally be spaced axially from one another by one or more axial spacer members.