Now simplified with a single derailleur cage length, the new Shimano Ultegra Di2 RD-R8150 12-Speed Rear Derailleur 34T Max packs Shimano's fastest, most precise shifting into a more approachable option. With Shimano's fastest, most accurate shifting, the new Shimano Ultegra Di2 RD-R8150 12-Speed Rear Derailleur 34T Max is more versatile than ever thanks to a single cage length option that is compatible with 28-34T low sprockets.

Features

• Shimano's fastest ever rear shifting, 58% faster than RD-R9150
• Compact design includes an integrated wireless unit, charger, and switch
• LED status indicator
  • Battery indicator
  • Pairing
  • Adjust mode, etc.
• Wider range capacity
  • Max. low sprocket: 34T