Race-Driven Rear Brake Rotors. You will receive 2 Brake Rotors to replace the rear rotor of the following models: 2017 Polaris ACE 900 XC Edition Race-Driven brake rotors are made from tempered stainless steel for not only a great look but optimal performance. Race-Driven offers stainless steel rotors to be purchased individually or as a kit including rotors and pads. Check out our other listings to see more options.