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