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. 45lb capacity. Product Details Adapter that makes your bike compatible with most mast-style hitch racks Installs quickly and securely to your seat post and stem to adapt a wide range of bikes for transport Keeps your bike mounted solidly on single and dual arm mounts Oversized diameter tubing and anti-rotation inserts for greater stability Large molded collars are gentle with your bike stem and seat post Bike Capacity: 1 bike weighing up to 45lbs. Product Specs Weight: 3.50 lbs. Dimensions: L 22.00 in x W 1.00 in x H 1.00 in