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