Focus RS Lightweight 2 Piece Rotor Set81-347-9911Each rotor is 4.3lbs lighter than stock. Free up rotational and unsprung weight for added performance, optimized handling, faster acceleration and braking. The directional, floating AeroRotors by StopTech allow independent expansion of the rotor and hat without "coning," thanks to elongated drive pin holes. ARK components include AeroRotor friction rings with patented internal vane design, pre-assembled to billet aluminum AeroHats with directional stand-offs that optimize cooling airflow.
The patented AeroRotor vane design pushes up to 80% more air than factory rotors for better cooling and reduced fade on the track.