Shimano Dura-Ace RD-R9150-SS Di2 Rear Derailleur - 11-Speed, Short Cage, Black

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Shimano Dura-Ace RD-R9150-SS Di2 Rear Derailleur - 11-Speed, Short Cage, Black
Low profile rear derailleur design
Ergonomic shifting operation without stress
Race endurance for less damage in crush
SHIMANO SHADOW RD
SHIMANO synchronized shift
Maintains compact and smooth appearance