Shimano GRX RD-RX817 Rear Derailleur - 11-Speed, Long Cage, Black, With Clutch, Di2, For 1x Black EA Rear Derailleur

IRDRX817 Shimano Shimano GRX RD-RX817 Rear Derailleur - 11-Speed, Long Cage, Black, With Clutch, Di2, For 1x Rear Derailleur EA Black Largest Cog 42 Color Black Rear Der/Shifter Compatibility Shimano Road Di2 Rear Derailleur Mount Type Shimano Rear Direct Mount Drivetrain Speeds 11 Weight 318 Chain Wrap Capacity (teeth) 31 Cage Length Long