Thule Sidearm Roofrack SecureHook holds the bike by grabbing the front wheel - no frame contact is made Ratcheting wheel strap quickly secures back wheel to tray Corrosion resistant double-wall aluminum tray provides maximum strength and rigidity One-Key lock cylinder (sold separately) locks the bike to carrier and carrier to rack Fits most 20 to 29 inch wheel diameter bicycles with tires up to 2.6 inches wide Fits Thule rack systems, round bars and most factory mounted racks. Please refer to the Thule Buyers Guide for more information.