for Shimano freewheel body. Shimano compatibility:combined with SunRace 12-speed Trigger it is compatible with the following Shimano rear derailleurs:- XTR (RD-M9000) SGS- XT (RD-M8000) SGS- SLX (RD-M7000-11) SGSSRAM compatibility:- XX1 Eagle- X01 Eagle- GX Eagle