Wide link Shadow design Dyna-Sys 10-speed top normal Deore rear derailleur Double servo-panda mechanism for smooth light action shifting Single tension spring prevents contact with the chain stay resulting in a silent ride Alloy and steel construction leads to lower weight without compromising strength and durability Wide link design increases rigidity and service life Top normal return spring lends to incredibly intuitive operation when combined with Rapid-fire shifters Large 11 tooth pulleys are used for longer life Two fluorine-coated link bushings for low-friction operation Dyna-Sys HG-X 10-speed compatible only 47T capacity SGS cage Compatible with 32-36T low sprocket