Shimano Ultegra FD-6700 Front Derailleur Triple , Silver, Band Type, 31.8mm Dual SIS front index shifting SG-X chainrings compatible Wide outer and inner link increases rigidity for improved shifting response Optimum spring tension 10% less spring tension than FD-6600 provides featherlight down shift and smooth shifter stroke Aluminum inner and outer links Smooth shifting under heavy load at each rear position 131 grams