Installs quickly and securely on a wide range of bikes Keeps your bike mounted solidly on single and dual mast mounts Larger diameter tubing and anti-rotation inserts for greater stability Larger molded collars are gentle with your bike stem and seat post If your top tube is funkier than a disco bass line, don't fret. The TubeTop makes your bike compatible with any hitch mount. Installs quickly and securely on a wide range of bikes. Keeps your bike mounted solidly on single and dual mast mounts. Larger diameter tubing and anti-rotation inserts for greater stability. Larger molded collars are gentle with your bike stem and seat post. Clamps will change from red to black in Spring 2017.