Deore M5120 Shadow plus 10/11-speed rear derailleur for dependable shifting performance and durability. Shadow plus features a super low profile design and optimized slant angle for super light shifting action. Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. Single tension spring prevents contact with the chainstay resulting in a silent ride Direct cable routing prevents snagging from any trail side hazards Wide alloy links and pivot body Fluorine-coated link pin bushings Strong return spring for a positive shifting feel Durable 11T bearing pulleys for low friction Top normal spring uses the spring to select higher gears HG-X11 11-speed and HG-X 10-speed compatible Max low sprocket: 46T (1x10-speed), 42T (2x11/2x10-speed)