Abstract: An adapter is provided for attachment to the hub of a vehicle axle whereby after attachment of the adapter to the hub, a pair of coaxial wheels can be secured to the adapter. The adapter is of simple construction and comprises a tubular cylindrical housing having a first and second set of circumferentially spaced axial bores formed therethrough. The first set of axial bores register with studs protruding axially outwardly from the axial hub of the vehicle so that the housing can be positioned over and secured to the axle hub by the appropriate nuts. The second set of axial bores is provided through the housing so that one bore from this second set is positioned between each pair of axial bores from the first set. A bolt is positioned through each of the second set of axial bores so that the threaded ends of the bolts extend axially outwardly from the housing.