Wide link design 105 double front derailleur for increased rigidity and improved shifting responseFor use with 105 ST-5700 or Ultegra ST-6700 shifters only for optimum shifting performanceWide inner link increased rigidityand takes front shifting performance to a new level, especially under heavy loadFor 10-speed drivetrainsLight action spring reduces effort required to actuate shiftsMaximum capacity of 16 teeth with 50-56 tooth outerThe aluminium parts arecoated to resist corrosion and maintain their great looks