The Summit Roof Mount Cycle Carrier (SUM-603) is designed to sit safely and securely on the roof of your car. It will hold one bike and fits most standard roof bars. Features include a two-part wheel tray for most bike tyres, easy storage, adjustable straps for wheel security, and U-Clamps for attachment to existing roof bars. The down tube clamp is adjustable to fit round or oval tubes up to 60mm diameter for round tubes and 100x60mm for oval tubes. This carrier is ideal for most bike frames but is not compatible with small children's bikes.