Shimano 105 5800 double 11sp braze on front mechthe 11 speed shimano 105 5800 front derailleur takes front shifting performance to a new level thanks to its wider inner link and longer pull arm features for use with 105 st 5800 or ultegra st 6800 shifters only for optimum shifting performancewide inner link increases rigidity and takes front shifting performance to a new level especially under heavy loadfor 11 speed drivetrainslong pull arm for light action spring reduces effort required to ac