Shimano Dura-Ace Di2 SM-EW90 5-Port Junction Box

$155⁰⁰

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Color

No Color

Type

5-Port

The Shimano Dura-Ace Di2 SM-EW90 5-Port Junction Box typically ships in 5-8 business days

Shimano | SKU: ISMEW90B | Option: No Color, 5-Port

This product is HSA / FSA eligible

Pickup available at RA Cycles - Brooklyn

Usually ready in 24 hours

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Shimano Dura-Ace Di2 SM-EW90 5-Port Junction Box Info

The Shimano Dura-Ace Di2 SM-EW90 5-Port Junction Box is the central hub of your Di2 wiring system — the point where shift wires from your levers connect to the rest of the drivetrain network. Known as Junction A, it sits under the stem and routes signals to the rear junction and ultimately to your derailleurs, while also providing a port for on-bike battery charging and firmware updates.

The 5-port version gives you room to run both standard brake/shift levers and aero bar shifters simultaneously, with spare ports for future expansion. If you're building out a more complex cockpit setup — dual input positions or additional switching options — this is the junction box you want from the start. Includes a mounting plate and two rubber straps for installation.