Description Make mast-style hitch racks work for your bike with the TubeTop. This handy adapter installs quickly and securely to the seat post and the stem to create a faux-top-tube for your bike. The result: it mounts solidly to the rack. Large molded collars are gentle to your bike’s finish. Dimensions: L 22.00in x W 1.00in x H 1.00in. Features & details Rack up your bike: The handy TubeTop makes your bike compatible with most mast-style hitch racks; Works with bikes that have sloped top tubes, such as mountain bikes, cruisers and more Simple and effective: Installs quickly and securely to your seat post and stem to adapt a wide range of bikes for transport Highly secure: Keeps your bike mounted solidly on single and dual arm mounts; Oversized diameter tubing and anti-rotation inserts for greater stability 1 bike capacity: Use it with 1 bike weighing up to 45 lbs; Large molded collars are gentle with your bike stem and seat post