Shimano - SM-EW90-B Junction Kit
SM-EW90-B
Junction kit for Shimano's Di2. This junction kit connects the STIs and the time trial switches to the optional EW-SD50 wire kit. For external installation. Not compatible with Flight Deck.This junction kit is equipped with connectors for ST-9071, SW-9071, SW_R671 or SW-R600. One additional port is used to connect to the optional EW-SD50 wire kit, which then connects the battery-pack, front and rear derailleur.
The additional wire kit EW-SD50 is required for operation.