Using the Thule HangOn 972 is easy. First, attach the rack to your towball. Make sure it's a compatible size: 1⅞” (not gooseneck / euro style 47mm), 2” or 50mm. You don't need to pre - adjust the coupling before fixing it. Then, place your bikes on the rack. The soft frame holders will keep them in place. If you have a bike with a non - standard frame, like a ladies' or BMX bike, use the Thule Bike Frame Adapter 982 (sold separately). You can tilt the rack to access your trunk even when bikes are loaded. When you're done, fold the rack flat for storage. Remember to check the rack's connection to the towball regularly. Keep the frame holders clean to ensure they hold your bikes securely. And store the rack in a dry place to prevent rust and damage.