These Performance Friction 2 piece rotors are the same type of rotors used on nearly all race cars. They are designed to be as light as possible while also maximizing cooling efficiency. This is done in several ways.
• Perfromance Friction rotors utilize aluminum hubs that bolt to the rotor by means of a series of springs and screws. Using an aluminum hat saves 6 lbs. per corner over your stock rotor. This is equivalent to 30 lbs. on each corner of your car!!! Hardware called McLaren Springs (so called because they were first used on the McLaren F1) allow the rotor and hub to expand at different rates (when heated and cooled), hence the term "floating rotors."
• Venting between the hub and the rotor allow excellent cooling of the rotor. Directional veins on the rotors also pull air away from the hub through the rotor. Better cooling leads to better rotor wear and can prevent cracking of the rotor.
• Performance Friction rotors utilize dimples rather than slots or drilled holes. This means that they will be less proned to cracking than drilled rotors, but will retain the cooling benefits of drilled rotors. Additionally, they will have increased surface area over slotted and drilled rotors; more surface area means better cooling and faster stopping.
Whether you drive on the street or on the track, you will actually be able to feel the difference in the way your car handles with these rotors. These rotors can be used with your stock calipers and will make more noise than your stock rotors due to the floating design.