Thule T2 Pro XT Add-On - This add-on to our premium Thule T2 Pro XT platform hitch rack allows 4 bike capacity (2in/50mm receivers only). Features Lock bikes to the rack with the integrated cable lock Eliminate bike interference by adjusting side to side to create generous spacing between bike mounts Secure bikes quickly without frame contact with the frame-free ratcheting arm Ideal for carbon frames, mountain, downhill, ebikes and fat bikes as it fits 20 - 29in wheels and up to 5in tires without adapters Not for use with front fenders