Rear derailleur Shimano ULTEGRA Di2 RD-R8050 SH 11-speed

DEORE XT M8050 Di2 derailleurs blend powerful performance with precise shifting that remains crisp and consistent over time. Featuring auto trim technology and an optimized cage design, the DEORE XT Di2 front derailleur tracks the movement of the rear derailleur and delivers perfect shifts from every gear combination. The Shimano Shadow RD low-profile geometry and chain stabilizer ensure drivetrain security while the electronic wire transmission maintains consistent performance in all weather and trail conditions.GS version compatible with CS-M8000 11-46t cassette (1x11) and 11-40/11-42 (2x11)SS version compatible with cassettes: 11-25T to 11-30TCage length (OPTIONAL): GS (medium) or SS (short)Total capacity GS: 35TSmallest sprocket GS: 11THighest difference of chain wheel GS: 10TTotal capacity SS: 33TSmallest sprocket SS: 11THighest difference of chain wheel SS: 16TSmall Sprocket Size Max.: 14 toothWeight: ~ 245 gMaterial: aluminum, stainless steel, steel, GFRPDi2 - The advantages of Di2 (Digital Integrated Intelligence) are clear for everybody who has tested it: changing gears becomes easier, effortless and faster by simply touching the shift buttons. Control at the top of your fingers. Additional benefits include an automatic trimming front derailleur, unmatched precision plus super easy installation and adjustment. This allows automatic chain guide movement in response to the gear position of the rear derailleur. There is no more need for concentration on trimming when riding. The mechanism rear derailleur, SHIMANO SHADOW RD, is intended for more aggressive riding. Its super low profile design carries many benefits. Because of its low profile and single tension construction, the derailleur does not hit the chain stay in rough riding conditions. The result is smooth and silent performance.Important: All Shimano Di2 electronic components require the same firmware version. In order to diagnose, read or update firmware, optional device is needed. Operating components with different firmware version may cause malfunction or loss of function.