🔗 Connect to Performance!
The SHIMANO4 PORT JUNCTION EW JC304 EW-SD300 PORT X 4 is a high-performance frame junction box that connects via SD50 E-tube wires to four essential points on your bicycle, ensuring seamless communication between the front derailleur, rear derailleur, cockpit junction box, and battery mount. Built with durable aluminum or stainless steel, it guarantees longevity and reliability while maintaining firmware compatibility across all Di2 components.
| Mounting Type | Clamp-On Mount |
| Case Material Type | Aluminum or Stainless Steel |
| Material Type | Aluminum or Stainless Steel |
D**Y
It works
Easy and small for in frame mounting with Velcro
P**Y
Works flawlessly
I connected the wireless Di2 shifter's using this junction.
H**.
Original part and fast delivery
Not much else to say, this Shimano Di2 junction box works perfectly.
M**1
Works as intended
This was purchased for the sole reason of updating the firmware on the 12-speed shifters. It allows you to connect the front derailleur cable to the the shifters with either one or two cables and update the shifter firmware. It worked without issue for this use.