The Shimano RD-R4000 11-speed rear derailleur is built for 2x11-speed road bikes offering smooth precise shifting. Its compact refined design combines lightweight construction with reliability for an exceptional road riding experience.Features Shadow RD that's intended for more aggressive ridingThe super low profile design with single tension construction to ensure the derailleur does not hit the chain stay in rough riding conditions - resulting in smooth and silent performanceBecause of its low profile and single tension construction the derailleur doesn't hit the chain stay in rough riding conditionsProvides a wider gear range capacityCompatible with CS-RS400 11-speed cassette (sold separately)Compatible with LINKGLIDE and HG 11-speed chains (sold separately)