CUSTOM FIT TIRE COVERS So who needs a tire cover Anyone who wants to keep all the dirt and dust off the rear-mounted spare tire. Plus a tire cover can prevent the sun's degrading UV rays from attacking that expensive rubber back there. Available in a variety of colors to fit your vehicle's color scheme. Premium fabric with cotton backing in color matching factory original colors. Eight custom sizes sewn with industrial strength thread. Sewn-in elastic band allows for a snug fit.