Shimano Dura-Ace RD-9150 Rear Derailleur

Shimano Dura-Ace RD-R9150 Di2 Rear Derailleur Shimano Dura-Ace RD-R9150-SS Di2 Rear Derailleur - 11-Speed, Short Cage, Black Color: Black Largest Cog: 30 Rear Derailleur Mount Type: 10x1 Standard , Shimano Rear Direct Mount Chain Wrap Capacity (teeth): 35