Di2 Junction
Shimano Di2 EW-JC304 SD300 4-Port Junction
A tiny four-way connector that sits inside the frame and joins EW-SD300 wires together. It is the part you need to run 12-speed Di2 levers fully wired, or to link several components back to the battery.
Highlights
Why we rate it
Enables wired shifting
Joins both 12-speed Di2 levers, the battery and other components on one wire network for a fully wired, coin-cell-free set-up.
Hides inside the frame
Small enough to tuck into a down tube or seat tube, keeping the cockpit clean.
Water-resistant plugs
Uses the sealed SD300 E-Tube connectors found across the 12-speed Di2 range.
Simple and passive
No firmware or electronics to update; it simply links the wires together.
Workshop friendly
Also useful for connecting diagnostic tools to the whole system when setting up a bike.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- EW-JC304
- Type
- Internal E-Tube junction
- Ports
- 4 (EW-SD300)
- Weight
- Approx. 5g
- Wire standard
- EW-SD300
- Compatibility
- Dura-Ace R9200, Ultegra R8100, 105 Di2 R7100, GRX RX825 Di2 (12-speed Di2)
- Wires
- Sold separately
In the box
- Includes
- EW-JC304 junction
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.