A bearing shield is mountable on a bearing outer ring such that the bearing shield extends radially inward toward a standardized bearing inner ring. An inner ring insert is mountable on the inner ring such that the inner ring insert extends a predetermined axial length beyond the inner ring and is engaged by a resilient seal member fixed to the bearing shield to seal an inner ring/outer ring annulus. The inner ring, inner ring insert, and an insert spacer provide a modular inner ring assembly of a predetermined length. Optionally, the inner ring insert can provide a "slinger" or join two inner rings together to form a bearing assembly with multiple rows of rolling elements.