When in the smallest chainring in the front, the R8050 Di2 rear derailleur will not shift into the smallest two cogs in the rear to prevent cross chaining and the chain rubbing on the inside of the large chainring. It comes set from Shimano like that and it cannot be changed. If you are in the small chainring and the third cog in and need a harder gear you will need to shift the front derailleur and then shift the rear to correspond. Remember that a 2x11 group has 22 gear but really only 14 unique gears because of overlap in the gear ratios.

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Brian Jacobson
Fit2Ride Velo Studio
http://www.fit2ridevelo.com