Shimano Ultegra RD-R8150F Di2 Rear Derailleur - 12-Speed, Medium Cage, Includes TL-EW300, Black Black EA Rear Derailleur

IRDR8150F Shimano Shimano Ultegra RD-R8150F Di2 Rear Derailleur - 12-Speed, Medium Cage, Includes TL-EW300, Black Rear Derailleur EA Black Largest Cog 34 Rear Der/Shifter Compatibility Shimano Road Di2 Rear Derailleur Mount Type Shimano Rear Direct Mount Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 12 Chain Wrap Capacity (teeth) 39 Cage Length Medium Color Black