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Description & Specs
Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300. Shimano Di2 Frame Junction Box
  • Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount
  • All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
  • Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
    • Description & Specs
    Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300. Shimano Di2 Frame Junction Box
  • Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount
  • All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
  • Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/

    • Shimano EW-JC304 Di2 Junction Box - 4 Ports Use With EW-SD300

    CY8903

    $35.04
    $35.04
    $44.64
    Shipping calculated at checkout.
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    Key Product Specs
    • Use With EW-SD300

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