If you have a spare tire mounted on the rear of your vehicle, the SpareJoe is an efficient, economical way to transport your bikes. It attaches easily to almost any spare tire (tire sizes P205/75R15 to 32x11.5/R15M) and adjusts for a snug, secure fit. Your bikes are held firmly with anti-sway cradles and centering them on the vehicle is a snap. Arms fold down when not in use. 2-bike capacity.