Avid Rotors and Rotor Mounting Parts. Features: G2 CleanSweep excellent choice for the Elixir 1/3, mechanical disc brakes and all older Avid brake models G3 CleanSweep great choice for Code brake models Features CleanSweep edges that keep pads clean while providing maximum stopping power and cooling (IS) International Standard 6-bolt (44mm BCD), (RH) 4-bolt Rohloff SpeedHub specific Specs: Model Description:G2 CleanSweep disc rotor Size:180mm