About this item Adventure ready: Load your bike in seconds whether it's a 20-inch wheel or a 29er; StrongArm design secures bike at wheels, protecting paint and carbon frames Smart design: Tilts down with bikes loaded so you can access the back of your vehicle; Accommodates disc brakes, thru-axles and full suspension bikes Unrivaled spacing: Carries 2 bikes out of the box, or 4 bikes with optional HoldUp +2. 1-1/4" or 2" Hitch Receiver; Side-to-side adjustability to adjust space between bikes Easy install: SKS Locks included for added security; +2. 1-¼-inch or 2-inch Hitch Receiver required We’ve got your back guarantee: Covered by our Limited Lifetime Warranty