A combination of a center cap (23, 31, 41) and a hub centering ring (21, 51, 81) for wheel rims with a center bore, said combination comprising: a wheel center cap (23, 31, 41) having a body portion with a front side (32, 42) and a rear side (33, 43) and a flexibly resilient part (34, 44) extending substantially orthogonal from the rear side of the body portion, each or at least part of the resilient part having a free end with a flange or stepped portion; and a hub centering ring (21, 51, 81) with a rear end (52, 82), a front end (53, 83), an interior surface (54, 84) and an outer surface (55, 85), wherein a radially outwardly turned retainer or retainer flange (56, 86) is provided at the rear end (52, 82) for retaining the ring (51, 81) in axial spaced relationship relative to the center bore of a wheel rim, and wherein a recessed groove (57, 87) is provided at the interior or outer surface at a distance from the front end (53, 83), said groove (57, 87) being dimensioned and arranged for receipt of the flange or stepped portion of the resilient part (34, 44) of the center cap (31, 41) to thereby retain the center cap (31, 41) in concentric relationship with the centering ring (51, 81), characterized in that the flexibly resilient part (34, 44) of the wheel center cap is formed by a plurality of flexibly resilient fingers (34, 44) extending substantially orthogonal from the rear side (33, 43) of the body portion, with each or at least part of the fingers (34, 44) having a free end with a flange or stepped portion, and in that the recessed groove (57, 87) of the hub centering ring (51, 81) is dimensioned and arranged for receipt of the flange or stepped portion of the fingers (34, 44) of the center cap (31, 41) to thereby retain the center cap (31, 41) in concentric relationship with the centering ring (51, 81), and further characterized in that a wheel hub recess (59, 89) is provided at the rear end part of the interior surface (54, 84) of the centering ring (51, 81), whereby the inner diameter of the centering ring (51, 81) is larger at the recessed rear end part than in the non-recessed middle part of the centering ring (51,81). a wheel center cap (23, 31, 41) having a body portion with a front side (32, 42) and a rear side (33, 43) and a flexibly resilient part (34, 44) extending substantially orthogonal from the rear side of the body portion, each or at least part of the resilient part having a free end with a flange or stepped portion; and a hub centering ring (21, 51, 81) with a rear end (52, 82), a front end (53, 83), an interior surface (54, 84) and an outer surface (55, 85), wherein a radially outwardly turned retainer or retainer flange (56, 86) is provided at the rear end (52, 82) for retaining the ring (51, 81) in axial spaced relationship relative to the center bore of a wheel rim, and wherein a recessed groove (57, 87) is provided at the interior or outer surface at a distance from the front end (53, 83), said groove (57, 87) being dimensioned and arranged for receipt of the flange or stepped portion of the resilient part (34, 44) of the center cap (31, 41) to thereby retain the center cap (31, 41) in concentric relationship with the centering ring (51, 81), characterized in that the flexibly resilient part (34, 44) of the wheel center cap is formed by a plurality of flexibly resilient fingers (34, 44) extending substantially orthogonal from the rear side (33, 43) of the body portion, with each or at least part of the fingers (34, 44) having a free end with a flange or stepped portion, and in that the recessed groove (57, 87) of the hub centering ring (51, 81) is dimensioned and arranged for receipt of the flange or stepped portion of the fingers (34, 44) of the center cap (31, 41) to thereby retain the center cap (31, 41) in concentric relationship with the centering ring (51, 81), and further characterized in that a wheel hub recess (59, 89) is provided at the rear end part of the interior surface (54, 84) of the centering ring (51, 81), whereby the inner diameter of the centering ring (51, 81) is larger at the recessed rear end part than in the non-recessed middle part of the centering ring (51,81).