Get maximum frame protection with this upright roof-mounted bike carrier, as it makes contact with only the wheel. A ratcheting wheel strap quickly secures the back wheel to the tray. The corrosion resistant double-wall aluminum tray provides maximum strength and rigidity. 2 One Key lock cylinders (sold separately) lock the bike to carrier and carrier to rack. Versatile design accommodates bikes with disc brakes, thru-axles and other non-traditional frame designs.