Now you can use wide-range cassettes (up to 50T) with your 11-speed Shimano MTB Di2 rear derailleurs. Just in few simple steps you can enhance the performance and shifting quality of your standard rear mech.
Moving the upper derailleur pulley closer to the smallest cassette cog, and lower one further away from the largest cog allows your 11-speed Shimano MTB Di2 rear derailleurs to operate seamlessly with wide-range cassettes, like Garbaruk 11-50T 11-speed model.