Front Brake Rotor Disc 11.8" for Harley-Davidson for Touring 2008-2013 for Dyna models 2007-2017 03342718Introductions: 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