SportRack - A30604 - Hitch'n'Drive 4 Bike Rack - (For 1.25"/2" Receiver) Hitch-mounted four-bike rack fits 1.25- or two-inch hitch receivers Single arm design accepts race, mountain, or touring bikes "No-wobble" threaded hitch pin prevents rack sway; rubber extrusion prevents damage to bikes' frames Bikes with top tubes up to 2.5 inches in diameter easily fit into the rack's receiver slots Tilts down for easy access to rear of your when not in use; locking kit, sold separately, also available