The term 'wheel edge' can be broken down into two parts: the RIM and the edge. The RIM is the outermost part of a wheel, which is typically made of metal or plastic and is connected to the hub. The edge is the outermost part of the RIM, which is usually rounded and provides a smooth transition between the tire and the RIM. Together, the RIM and edge form the wheel edge, which is an important part of the overall wheel structure.