Completely redesigned ultegra front derailleur for use with ultegra st6700 shifters only for optimum shifting performance 10 less spring tension provides a feather light down shift and smooth shifter stroke wide inner link increased rigidity and takes front shifting performance to a new level especially under heavy load the forged wide link cradles the axle pivot at both ends providing a smooth shifting swing improved chain guide shape capacity 16t 40fd 670041 22t 40fd 6