Stainless Steel Super Spoke 11.5" Front Brake Rotor Rotors Brak Disk Fit Harley 1984-2013 02744494Introductions: The brake disc (or rotor) is the rotating part of a wheel's disc brake assembly, against which the brake pads are applied. The material is typically gray iron, a form of cast iron. The design of the discs varies somewhat. Some are simply solid, but others are hollowed out with fins or vanes joining together the disc's two contact surfaces (usually included as part of a casting process). The weight and power of the vehicle determines the