This is a Yakima Tube Top Frame Adapter. Hook any funky-top-tubed bike to a mast-style hitch rack with the TubeTop. Installs quickly and securely to seat post and stem to create a faux-top-tube so your bike mounts solidly to the rack. Large molded collars are gentle to your bike's finish. Features: Adapter that makes your bike compatible with most mast-style hitch racks Installs quickly and securely on a wide range of bikes Molded collars are gentle with bike stem and seat post Larger diameter tubing and anti-rotation inserts for greater stability Keeps bike mounted solidly on single and dual mast mounts 1 bike capacity weighing up to 45 pounds 14 at its shortest, 30 maximum 3.5lbs Specifications: Packaged Weight: 3.35 lbs. Package Dimensions: L 24.25" X W 4.00" X H 2.00" Capacity: 1 We strive to provide multiple options for ensuring that your bike is secured properly when being transported. Check out our other in stock options HERE.