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Shimano Dura-Ace 11sp Di2 SS RD-R9150 Rear Derailleur Fatigue-free ergonomic shifting operation Shimano SYNCHRONIZED SHIFT Low profile shifting design Shimano SHADOW RD Maximum strength for Endurance racing Compact and linear appearance maintained The DURA-ACE 9100 front derailleur combines aerodynamic SHADOW design with more range options in a lightweight and attractive mechanism intended for discerning cyclists. The RD-9150 DI2 version offers the digital precision of Shimano electronic shifting and synchro shifting.