The Allen Premier QR hitch rack is the perfect way to transport your bicycles on road trips or camping excursions. Locking hitch insert fits either 1 1/4" or 2" receiver hitches (2 and 3 bike models) or 2" receiver hitches (4 and 5 bike models). Patented, quick install hitch insert secures and tightens rack inside of receiver hitch; includes two keys. Quick-fold carry arms drop out of the way when not in use. Rapid tilt-away feature for easy lift-gate access. Dual-compound tie-down cradles with quick-secure straps protect your bicycles during transport. Accommodates a wide range of bicycle frame designs. Large padded spine shield protects your bicycles from the rack and an included tie-down strap helps you keep everything in place while you're driving. Minor assembly required. No tools needed to install rack to vehicle. Important installation note: never use on trailers. Will not work with Class I receiver hitches. VIEW HITCH BASE DIMENSIONS