The Shimano M5120 Deore Rear Derailleur 10/11-speed Shadow+ is great for dependable shifting performance and durability, featuring asuper low profile design and optimized slant angle for super light shifting action.Shimano M5120 Deore Rear Derailleur 10/11-speed Shadow+ Highlights-Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shiftingSingle tension spring prevents contact with the chainstay resulting in a silent rideDirect cable routing prevents snagging from any trail side hazardsWide alloy links and pivot bodyFluorine-coated link pin bushingsStrong return spring for a positive shifting feelDurable 11T bearing pulleys for low frictionTop normal spring uses the spring to select higher gearsHG-X11 11-speed and HG-X 10-speed compatibleMax low sprocket: 46T (1x10-speed), 42T (2x11/2x10-speed)41T capacity SGS cage