Shimano Ultegra RD-R8150F Di2 Rear Derailleur – 12-Speed Medium Cage Includes TL-EW300 Black. With the fast and accurate Di2 shifting technology the Shimano 12-speed Ultegra RD-R8150 rear derailleur is extremely versatile thanks to a single cage length option compatible with 11-28 11-30 and 11-34 cassettes.

• TECH SPECS

Largest Cog 34Rear Der/Shifter Compatibility Shimano Road Di2Rear Derailleur Mount Type Shimano Rear Direct MountRear Derailleur Mount Type 10×1 StandardDrivetrain Speeds 12Chain Wrap Capacity (teeth) 39Cage Length MediumColor Black