"Transport up to 4 bikes securely without wheel to wheel contact on the Malone Runway Hitch-Mounted Platform Bike Carrier. This carrier works with 2"" hitch receivers and has padded, vertically-adjustable center arms to firmly hold each bike’s top tubes for worry-free transport. It can carry up to 4 bikes, each weighing no more than 33 lbs., and fits 20"" to 29"" wheels and tires up to 3.5"" wide. Key-locking knobs provide added security, and the center arms can tilt down for convenient access to the rear hatch or trunk. An anti-wobble hitch pin reduces rattle during transport."