There might be no Di2 function that is as nice as shifting the front derailleur.
It's miles ahead of any mechanical group and Shimano brings reliable Di2 technology and performance to Ultegra for precise and effortless shifting. This latest Di2 version is the R8050 and it's 11-speed compatible. The R8000 is slimmer so it plays better with bigger rear tires and sheds about 22 grams over the RD-6870. Blindfolded, we're not sure if we could tell you if a shift was executed with a Dura Ace or Ultegra Di2 derailleur.
1 - An electronic front derailleur for unmatched performance
2 - More clearance for frames with bigger tires disc brake chainlines
3 - Auto-trims preventing chain rubbing
4 - E-tube lets you customize shifting
Weight: 132 g
Derailleur Type: Braze On