Junction kit for Shimano's Di2. It connects the time trial switches to the EW-SD50 wire kit. One additional port is used to connect to EW-SD50 wire kit, which then connects the battery-pack, front and rear derailleur. For external installation. Not compatible with Flight Deck.
The additional wire kit EW-SD50 is required for operation.
Note: In order to ensure proper functioning of the electronic Di2 drive system, all components require the same firmware version. The optional diagnostic device allows for reading out or updating the firmware version. An operation of components with different firmware versions may cause a malfunction or loss of function.
Shimano SM-EW90-A Junction Kit for Dura Ace + Ultegra Di2 TT external