https://www.stackshelves.com/products/portable-tire-rack/ The portable tire rack is composed of a chassis structure and four upright poles. The upright poles can be disassembled. The chassis is made of square tubes and has a solid structure. You can choose whether to add iron mesh sheets to the chassis. The surface of the portable tire storage rack is made of electrostatic spray plastic, which is environmentally friendly and beautiful, styles and colors all support customization.