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Shimano EW-JC304 Di2 Junction Box

Shimano EW-JC304 Di2 Junction Box

$ 560.00 MXN
$ 560.00 MXN
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Shimano's EW-JC304 junction box has four slots that are compatible with the EW-SD300 power cable for outdoor installation and the EW-SD300-I power cable for indoor installation. It is used for the fully wired installation of the Dura-Ace and Ultegra Di2 2x12-speed groupset. This setup is mandatory for the rim brake version, although there is also an alternative wiring option without EW-JC304. With the disc brake version, full wiring is optional and always requires this box. The distributor, which takes on the function of Junction B, is mounted internally in the frame near the cockpit, preferably in the head tube. You connect it to the shift/brake levers on one side, while on the other side a third cable leads to the battery, which is located in the seatpost. Completely wired shifting is not possible with the 105 Di2 R7150 groupset, but EW-JC304 can be used as a contact point if required. It can also be used to wire Shimano EP8 and EP6 series e-bikes, as these also work with the E-Tube platform. Older EW-SD50 cables are not compatible.
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