Deore M5100 Shadow plus 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. It uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. The single tension spring prevents contact with the chainstay resulting in a silent ride. 13T pulleys and decreased derailleur tension prevent high chain tension in low gears. Direct cable routing prevents snagging from any trail side hazards Specification: Wide alloy links and pivot body Fluorine-coated link pin bushings Strong return spring for a positive shifting feel Durable 13T bearing pulleys for low friction Top normal spring uses the spring to select higher gears Max low sprocket: 51T (1x 11-speed) 40T capacity SGS cage