This Adapter Kit is normally included with the B&W ASF (anti-shock frame) that comes with the bike.case or bike.bag. It allows you to mount your standard QR-hub bike onto the Aluminum mounts. We also have a special adapter set to work for all thru-axle sizes 12, 15 and 20 mm diameter sizes (MPN 96317). The machined plastic pieces are inserted into the metal tube on our frame adapter, then the bike is mounted on the support and set to the right height for travel. We also have "Lefty" adapters for the Cannondale forks which are sold separately.