Authorization announcement no: CN203793309U authorization announcement date: 20 14.08.27 application no: 201420/693578 application date: 20 14.04.09 patent holder: Jiang Pi. Classification number. 38+0: b60s13/00 (2006.01) 1. Patent agency: Beijing University of Commerce Yongxin Intellectual Property Agency (general partnership) 1 1400 Agent: Gao Zhibo; ? The utility model discloses an auxiliary wheel assembly, which comprises an auxiliary wheel, connecting rods and a support rod, wherein the auxiliary wheel is connected with the support rod, and a plurality of connecting rods are respectively arranged at both ends of the support rod, one end of the connecting rod is connected with the end of the support rod, and the other end is movably connected with the frame. The connecting rod of the auxiliary wheel assembly is movably connected with the frame. When the rear wheel of a two-wheeled vehicle bursts, the connecting rod rotates around the connection point with the frame, so that the auxiliary wheel is put down and the rear wheel is placed on the support rod. When the two-wheeled vehicle is pushed, the auxiliary wheel rotates instead of the rear wheel, which reduces the burden of the cart and prevents the tire from being damaged twice. The auxiliary wheel assembly is convenient to use and simple in structure.