Abstract: An imbalance compensating vehicle wheel attachment having a rim structure for mounting to a vehicle wheel, and further having a plurality of spokes or sectors coupled to the rim structure and extending radially inwardly to a hub structure. A mounting arrangement is provided to couple the inward extremities of the sectors to the hub structure to enable radial slidable movement of the sectors relative to the hub structure whereby the masses of the hub structure and sectors are dynamically movable to establish a radius of gyration tending to compensate for any wheel imbalance.