A mounting arrangement for adding an auxiliary wheel spaced from an existing wheel of a motor vehicle including three generally cylindrical spacers connected together abutting end to end, an inner spacer attached to a brake assembly member with a preexisting wheel rim compressed between an inside face of the inner spacer and the brake assembly member, an intermediate spacer attached to an outside end of the inner spacer by bolts passing through axial holes through the intermediate spacer end threaded into holes in the outside end of the inner spacer and an outer spacer connected on its inside end to the outer end of the intermediate spacer by bolts, and holding stud bolts extending out and received through holes in the auxiliary wheel rim, with lug nuts fixing the rim of the auxiliary wheel against the outside end of the outer spacer.