12-speed E-tube Di2 compatible. The rear derailleur is now the brains of the system with wireless connectivity to the shifters. Derailleur contains a saver (fuse) function; where the inner structure is protected from strong impacts.
shimano ultegra di2 12 speed groupset
2024 M Bianchi Aquila Dura-Ace Ultegra Di2 12 Speed Carbon TT Triathlon Rim Bike
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