Dura Ace DI2 Sm-ew90-b 5 Port Junction a
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Description
The Shimano Dura-Ace Di2 SM-EW90-B is a 5-port Junction A unit — the nerve centre of a Di2 electronic groupset. It routes power and signal to every connected component, keeping your shifting crisp whether you are climbing the Western Ghats, rolling through Delhi's winter smog, or pushing pace on Chennai's coastal roads. Clean wiring, reliable connections, and Shimano's precision engineering make it an essential part of any Di2 build.
Use Cases
Daily training. Reliable use across Indian training conditions — heat, humidity, and rough tarmac.
Race day. Performance-grade construction for competitive efforts.
Long rides. Built for full-day rides across Western Ghats, Sahyadri, or Nilgiri climbs.
Our Take
If you are building or upgrading a Dura-Ace Di2 drivetrain in India, the SM-EW90-B Junction A is non-negotiable. Five ports give you the flexibility to run internal or external wiring without compromise. In a country where humidity, monsoon moisture, and 35°C+ heat stress every electrical connection, having a genuine Shimano junction unit — not a substitute — means your shifts stay reliable from Lonavala descents to Ooty climbs. This is the kind of small component that makes the whole system work.
Sizing for Indian Riders
This is an electronic wiring component, not an apparel item, so body measurements do not apply. What does matter is your frame's internal routing architecture. Road frames with internal Di2 routing will typically use the handlebar-mount version; confirm your frame's junction port location before ordering. Contact Cobbled Climbs if you are unsure which junction variant suits your frameset.
Compatibility Notes
The SM-EW90-B is designed for Shimano Di2 electronic groupsets and uses EW-SD50 or EW-SD300 E-tube wires. It is compatible with Dura-Ace Di2 and works within the broader Shimano E-Tube ecosystem. Verify your frame's wiring ports, cable lengths, and Di2 generation before ordering. All Shimano products at Cobbled Climbs are 100% genuine and authorised.
Pairs Well With
Complete your Di2 setup with Di2 E-tube junction wires, a Di2 battery and charger, a Di2-compatible rear derailleur and front derailleur, and a Di2 display or wireless unit. A quality torque wrench is also recommended for clean installation.
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Specifications
| Specification | Detail |
|---|---|
| Brand | Shimano |
| Product Type | Cycling Product |
| Shipped From | Mumbai, India |
Explore the full Shimano collection at Cobbled Climbs
Why buy from Cobbled Climbs
- 100% genuine — authorised Shimano retailer in India
- Free delivery on orders above Rs. 2,500
- Cash on delivery available nationwide
- 7-day easy returns
- Shipped from Mumbai
- Expert advice — built for Indian cycling conditions
Frequently Asked Questions
What is the Shimano Dura-Ace Di2 SM-EW90-B Junction A best used for?
The SM-EW90-B is the central wiring hub in a Shimano Di2 electronic drivetrain build. It connects the battery, derailleurs, shifters, and display units through E-tube wires. It is best suited to riders building or servicing a Dura-Ace Di2 groupset on a road bike, whether for racing, gran fondo events, or high-end training builds across India.
How do I know if the SM-EW90-B is the right junction unit for my Di2 build?
The SM-EW90-B features five ports, making it suitable for more complex Di2 setups with multiple connected components. Check your frame's internal routing ports and count the Di2 components in your system — derailleurs, shifters, battery, and display. If unsure, contact Cobbled Climbs with your frame details and we can confirm the correct junction unit for your build.
Will the SM-EW90-B hold up in Indian monsoon conditions and 35°C+ heat?
Shimano's Di2 wiring system is designed to handle humidity, dust, and temperature variation encountered in real-world riding. The junction unit's E-tube connectors are secure and weather-resistant under normal cycling use. For riders tackling monsoon rides in Pune or Kochi, ensure all connectors are fully seated and wiring is routed to minimise direct water ingress for long-term reliability.
How does the SM-EW90-B compare to a standard 3-port Di2 junction unit?
The SM-EW90-B offers five ports versus the three ports found on simpler Di2 junction units. This additional capacity suits builds with more connected components — such as a wireless unit, display, or additional satellite shifters. If your setup is straightforward with fewer components, a 3-port unit may suffice, but the 5-port provides greater flexibility for future upgrades.
Is the Shimano Dura-Ace Di2 SM-EW90-B worth ₹11,030 in India, and what warranty applies?
For a Dura-Ace Di2 build, the SM-EW90-B is an essential and irreplaceable component — skimping on the junction unit risks the reliability of the entire electronic system. At ₹11,030, it represents fair value for a genuine Shimano part. Shimano's standard component warranty applies; Cobbled Climbs handles warranty support as an authorised retailer, with COD and free delivery above ₹2,500.
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Shipping:
We ship all orders within 48 hours, excluding Sundays and public holidays. Delivery typically takes 3 to 5 days depending on your location.
Returns:
If your item arrives damaged, incorrect, or doesn’t fit, you may request a return within 7 days of delivery. Email us at support@cobbledclimbs.com with your order details. Items must be unused and returned in original packaging with all tags and labels intact.
Sale Item Guidelines:
Products purchased on sale are final sale and not eligible for return or exchange. Please double-check sizing, fit, and product details before purchasing.
Please note:
We follow a no money refund policy. Eligible returns are offered store credit or exchange only.
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Dura Ace DI2 Sm-ew90-b 5 Port Junction a
Earn up to Rs. 551.50 cashback with Club House
Frequently Asked Questions
Does Cobbled Climbs ship Dura Ace DI2 Sm-ew90-b 5 Port Junction a across India?
Is the Dura Ace DI2 Sm-ew90-b 5 Port Junction a on Cobbled Climbs 100% authentic?
What is the return and exchange policy for Dura Ace DI2 Sm-ew90-b 5 Port Junction a?
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