HEF1039 Features: * Top tube alternative adapter * Adjust from 15.5" to 30" in length * Attaches to seat stem and handle bar stem * Connects under seat stem and handle bar stem * One top tube alternative per bike * Secure storage and easy transport * Allows attachment of smaller and different framed bikes, like kids and women"s bikes Dimensions: * Dimensions: 24" H x 4" W x 4" D