This add-on to Thule's premium T2 Pro XT platform hitch rack allows 4 bike capacity (2"/50mm receivers only). Frame-free ratcheting arm secures bikes quickly without frame contact Fits 20-29" wheels and up to 5" tires without adapters making it ideal for carbon frames, mountain, downhill, or fat bikes. Not compatible with 27.5" fat bikes Integrated cable lock and lock knob secures bikes to the rack and the rack to the receiver Generous spacing between bike mounts with the ability to adjust side to side to eliminate bike interference Compatible with 2” hitch only