Brake Rotor Disc for Yamaha Rhino 660 YXR660 2004-2008 Front by Race-Driven Race-Driven Front Standard Brake Rotor. Race-Driven Rotors are a quality tempered stainless steel affordable replacement for OEM Standard rotors are designed to replace original stock rotors 2004 - 2005 - 2006 - 2007 Yamaha Rhino 660 YXR660 4x4