Abstract: In the single-nut wheel assembly (1) the mutual contact surfaces (13, 23) between the nut (4) and the hub (3) do not rotate against each other during rotation of the nut (4). For this purpose, the nut (4) (or as an alternative the rim (3)) is provided in two bodies (15, 16) free to rotate mutually thanks to the interposition of antifriction means (17). The force necessary for tightening and loosening the nut is thus reduced.

Abstract: The light alloy wheel assembly for motor vehicles includes a rim for mounting a tire, a wheel hub for fixing the wheel assembly to a motor vehicle axle hub, a disc or spokes connecting the wheel hub and the rim, a false hub to be fixed on the vehicle axle hub and to allow fixing thereon of the wheel hub, and bolt/bore/seat arrangements for tightening and centering the false hub on the vehicle axle hub. A number of centering pins are provided on the false hub, with a corresponding number of bores on the wheel hub. A central threaded pin is formed on the false hub, a corresponding central bore is formed in the wheel hub, a nut is provided for screwing on the threaded pin, and a striker seat for the nut is formed on the flange around the central bore. Such a wheel assembly permits mounting of a single-nut wheel on the axle hub of a motor vehicle.