FRONT DERAILLEUR SHIMANO FD-7970 DURA-ACE DI2

Front derailleur Shimano Dura-ace di2 7970. Shimano product code: FD7970F. The front derailleur's more powerful internal guts supposedly deliver quicker and smoother shifts than mechanical systems, especially under load. The system CPU is also housed here and a self-trimming function automatically adjusts the cage in response to the position of the rear derailleur on the cassette to eliminate chain rub.