Shimano has simplified and improved the front junction box (junction A) for Di2. The new Di2 unit utilizes a rubber strap that cleanly and aerodynamically fastens underneath the stem. The junction box has a charging port that makes it possible to charge both internal and external batteries without having to remove them from the bike.
Features of Di2 Junction-A Box
Shimano Dura‑Ace SM‑BB9000 Bottom Bracket
Shimano Dura‑Ace FC‑9000 Crankset
Shimano Dura‑Ace 9070 Front Derailleur Adapter
Shimano Dura‑Ace 9070 Front Derailleur
Shimano Dura‑Ace 9070 Rear Derailleur
Shimano Dura‑Ace Di2 ST‑9071 TT Shifters
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