Unrivalled shift performance & stability. Shimanos XTR M9050 Di 2 rear derailleur delivers unrivalled chain control & shift performance that doesn’t degrade over time. With Shimano Shadow RD+ clutch technology, the RD-M9050 is the ultimate mountain bike rear derailleur. Its damage. A refined geometry augments Shimano’s already legendary performance stability while system communication with the front derailleur makes Shimano Synchronised Shift a possibility. Key Features Instantaneous shift response to rider input Shimano synchronised shift compatible Advantage in all conditions Low profile positions rear ech safely away from trail obstacles Seamless gear changes System communication with front mech E-tube electric wire transmission guarantees stable performance 1x, 2x & 3x compatible with GS & SGS cage options