Shimano Ultegra Di2 R8050 11sp Front Derailleur

even when youre shifting to the large chainring while riding out of the saddle., Quick and smooth front shifting is guaranteed under all circumstances

allowing both derailleurs to work together efficiently, Due to SHIMANO SYNCHRONIZED SHIFT the front derailleur will shift automatically when the rear derailleur is shifted

obtaining optimal front/rear gear positioning., With SEMI-SYNCHRONIZED SHIFT its the other way around, with the rear derailleur shifting automatically when the front derailleur is shifted

At the same time, avoiding chain rub as you move the chain across the cassette, Di2s auto-trim feature will automatically centre the front derailleur precisely around the chain

precise and smooth your shifting can be., This is how fast