these forces would inevitably lead to damage of the outwardly facing surface 13 in order to prevent damage to the outer shoulder 19 of the wheel rim 9 or damage to the wheel flange 20 during the tightening of the wheel rim 9 on the mounting disk 1 by nut 14 a connecting piece 15 and a cone 16 are provided between the center hole 17 of the wheel rim 9 and the nut 14 a threaded pin 18 extends outwardly from the mounting disk 1 and the nut engages the threads on the pin plastic disks 22 on the surface 21 of the mounting disk 1 face the wheel rim 9 according to the embodiment of fig1 after the tire has been mounted via the wheel flange 12 of the wheel rim 9 the wheel rim 9 is released by loosening of the nut 14 the wheel rim is turned over with the partially mounted tire so that wheel flange 12 now comes to lie on the plastic disks 22 then the wheel rim is once against secured by tightening the nut 14 but without the connecting piece 15 and optionally with the cone 16 moreover the length of the pins 10 as carriers is dimensioned in such a manner that even when the wheel rim 9 is turned over pins 10 penetrate the wheel lug attachment holes 11 a firm stabilization is assured fig2 illustrates direct connection of the mounting disk 1 with.