The Shimano RD-M9050 Shadow RD+ SGS 11-speed rear derailleur weighs 295g, features direct mount, a clutch mechanism, and smooth shifting even under heavy load.
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Its low sprocket max capacity is 40T for 3x11 setups, 42T for 2x11-speed and 46T for 1x11-speed setups. The max front difference is 18T and its total capacity is 41T.
One of the MTB displays (SC-MT800 display or the XTR SC-M9051) is required if you want to use synchronized shift with MTB derailleurs.
Indexing Di2 rear derailleurs is done though micro-adjustment. The MTB Di2 rear derailleur process is slightly different from that of road RDs. Read how to set up your MTB rear derailleur and stop that chain rubbing noise.
Synchronized Shifting - what is it exactly? What does it do and how can you set it up? This page will guide you through the process of setting up synchro shift.
Shimano front derailleur and rear derailleur specifications... what do they mean, really? This page explains all of them, and why they matter.
