Shimano SM-EW90-B E-Tube Junction-A For Dura-Ace Di2 TT/Triathlon Handlebar

About This Product

This is a crucial little piece for your Shimano Dura-Ace Di2 electronic shifting system on a time trial or triathlon bike. It's the SM-EW90-B E-Tube Junction-A, a 5-port junction box that connects all your Di2 wires inside the handlebar or aerobar. It's brand new, genuine Shimano, made in Japan, and is essential for a clean, functional internal wiring setup on TT/Tri bikes. Part number is 325279, UPC is 617395134489. If you're building up a new Di2 TT bike, repairing your system, or just need a spare junction, this is the exact part you're looking for. It ensures all your electronic shifters and buttons communicate seamlessly with the main battery and derailleurs.