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.

• Compact design includes an integrated wireless unit, charger, switch
  
• Wider range capacity
  
• Max. low sprocket 34t
  
• LED status indicator
  
• Battery indicator, pairing, adjust mode etc.
  
• Largest Cog: 34
  
• Rear Derailleur Mount Type: Shimano Rear Direct Mount , 10x1 Standard
  
• Chain Wrap Capacity (teeth): 39
  
• Rear Der/Shifter Compatibility: Shimano Road Di2
  
• Cage Length: Medium
  
• Drivetrain Speeds: 12
  
• Color: Black