Wide link design 105 double front derailleur for increased rigidity & enhanced shifting response For use with 105 ST-5700 or Ultegra ST-6700 shifters only for optimum shifting performance Wide inner link increased rigidity & takes front shifting performance to a new level especially under heavy load For 10-speed drivetrains Light action spring reduces effort required to actuate shifts Maximum capacity of 16 teeth with 50-56 tooth outer The aluminium parts are coated to resist corrosion & maintain their great looks