di2 (digital integrated intelligence) Electric drivetrain with the best of brains and brawn. The revolutionary DI2 shifting system solves the challenges drivetrains present to the powerdelivery equation in cycling.
At the same time, Di2s autotrim feature will automatically centre the front derailleur precisely around the chain, avoiding chain rub as you move the chain across the cassette. This is how fast, precise and smooth your shifting can be. Amazon. com: Shimano Ultegra Di2 FDR8050 Front Derailleur Gray, BrazeOn: Sports& Outdoors Rear Derailleur (Di2) User's manuals in other languages are available at: todate information is available on the Shimano website.
Shop with confidence. How to Adjust Shimano Di2 Front Derailleurs The beauty of Di2 is that there are no cables to stretch or break in. So that perfect precision shifting that electronic systems are known for stays perfect.