Retrofitting shelves attachable to a shelving system, shelving systems, and methods of displaying items on a shelving system. In one form, the retrofitting shelf includes a supporting unit, pivoting mechanisms attachable to the supporting unit, and a continuously adjustable device for dividing items on the shelving system which is attachable to the supporting unit. In another form, the shelving system includes a base, vertical members attached to the base, and a retrofitting shelf attached to the vertical members. In yet another form, the method for displaying items on a shelving system includes attaching a retrofitting shelf to the shelving system and placing items on the supporting unit of the retrofitting shelf.