Shimano EW-JC304 4-PORT JUNCTION Di2
The Shimano EW-JC304 4-Port Junction is a compact internal wiring junction designed for Shimano Di2 electronic shifting systems. It acts as a central connection hub, allowing up to four Shimano E-Tube SD300 wires to connect together inside the bike frame.
Primarily used with newer 12-speed Di2 road and gravel groupsets, the EW-JC304 helps create a cleaner internal routing setup by linking components such as:
- Shift levers
- Front derailleur
- Rear derailleur
- Internal battery
Its small size allows it to be hidden neatly inside the downtube, bottom bracket area, or handlebars for a tidy build. The unit is compatible only with Shimano’s newer EW-SD300 thin-wire system, not older SD50 Di2 wiring. Shimano designed it as a simple, reliable, water-resistant junction for modern internally routed bikes.
Original: $23.18
-65%$23.18
$8.11Product Information
Product Information
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Description
The Shimano EW-JC304 4-Port Junction is a compact internal wiring junction designed for Shimano Di2 electronic shifting systems. It acts as a central connection hub, allowing up to four Shimano E-Tube SD300 wires to connect together inside the bike frame.
Primarily used with newer 12-speed Di2 road and gravel groupsets, the EW-JC304 helps create a cleaner internal routing setup by linking components such as:
- Shift levers
- Front derailleur
- Rear derailleur
- Internal battery
Its small size allows it to be hidden neatly inside the downtube, bottom bracket area, or handlebars for a tidy build. The unit is compatible only with Shimano’s newer EW-SD300 thin-wire system, not older SD50 Di2 wiring. Shimano designed it as a simple, reliable, water-resistant junction for modern internally routed bikes.
