---
product_id: 2424832
title: "Ultegra Di2 Internal Routing Junction Box"
brand: "shimano"
price: "E£ 3890"
currency: EGP
in_stock: true
reviews_count: 8
category: "Shimano"
url: https://www.desertcart.com.eg/products/2424832-ultegra-di2-internal-routing-junction-box
store_origin: EG
region: Egypt
---

# Seamless electronic shifting integration Internal routing for sleek bike aesthetics 2-year manufacturer warranty for peace of mind Ultegra Di2 Internal Routing Junction Box

**Brand:** shimano
**Price:** E£ 3890
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your ride with invisible tech — shift like a pro, look like a legend!

## Quick Answers

- **What is this?** Ultegra Di2 Internal Routing Junction Box by shimano
- **How much does it cost?** E£ 3890 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.eg](https://www.desertcart.com.eg/products/2424832-ultegra-di2-internal-routing-junction-box)

## Best For

- shimano enthusiasts

## Why This Product

- Trusted shimano brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Backed by Shimano’s 2-year warranty, ensuring durability on every ride
- • **Lightweight Precision:** Weighs just 13.6g, adding minimal bulk while maximizing efficiency
- • **Sleek Internal Routing:** Keeps your bike’s wiring hidden and streamlined for a clean, pro look
- • **Effortless Electronic Sync:** Connects all Di2 components for flawless shifting performance
- • **Universal Ultegra Compatibility:** Designed specifically for Ultegra 6770, 6870 & Dura-Ace 9070 systems

## Overview

The Shimano Ultegra Di2 Internal Routing Junction Box (SM-JC41) is a compact, lightweight hub that seamlessly connects all electronic shifting wires for Ultegra and Dura-Ace Di2 systems. Designed for internal cable routing, it enhances bike aesthetics while delivering reliable, precise shifting backed by a 2-year warranty.

## Description

Shimano’s E-Tube Di2 Junction Box (also known as the B junction) connects all your component and battery wires to make assembly much easier. It's a crucial item along with the five required wire sections to operate your Ultegra 6770, Ultegra 6870, or Dura-Ace 9070 Di2 shift system. The E-Tube Di2 Junction Box is available in two configurations: Internal (SM-JC41) and External (SM-JC40).

Review: Brand new. - A must.
Review: expensive but functional - It is an expensive item for its size but essential to install Di2

## Features

- Crankset Compatibility: 2 x 10
- Compatible Components: Shimano Ultegra Di2
- Recommended Use: ditching your mechanical tethers
- Manufacturer Warranty: 2 years
- Actual Weight Notes: Weight is for Di2 Junction B.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005DTRW0E |
| Best Sellers Rank | #478,031 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #251 in Bike Cables |
| Brand Name | SHIMANO |
| Color | One Color |
| Customer Reviews | 4.7 4.7 out of 5 stars (57) |
| Date First Available | July 21, 2011 |
| Item Dimensions LxWxH | 3 x 4 x 2 inches |
| Item Package Dimensions L x W x H | 4.4 x 2.2 x 1.3 inches |
| Manufacturer | Shimano |
| Material | Plastic |
| Model Year | 2012 |
| Number of Items | 1 |
| Package Weight | 13.61 g |
| Part Number | SH4255 |
| Size | Internal/SM-JC41 |
| Sport Type | Cycling |

## Images

![Ultegra Di2 Internal Routing Junction Box - Image 1](https://m.media-amazon.com/images/I/51UT4AB5t5L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Brand new.
*by S***S on October 14, 2025*

A must.

### ⭐⭐⭐⭐⭐ expensive but functional
*by C***S on December 28, 2022*

It is an expensive item for its size but essential to install Di2

### ⭐⭐⭐⭐⭐ Internal wiring junction box - picture is wrong
*by H***X on June 11, 2014*

If you are going to run your Di2 cables inside the frame tues, this is the part you want. The picture is of the external mount box, but the internal box is the one I received. Just remove your crank, plug in your 4 wires, tuck this back into the frame tube, reinstall the protector sleeve and crank and you are all set. A very clean install of shifting perfection!!

## Frequently Bought Together

- Shimano Ultegra Di2 Internal Routing Junction Box
- Shimano Ultegra Di2 EW-SD50 Electric Wire
- SHIMANO EW-RS910 E-Tube Di2 Frame or bar Plug Mount Junction A, Charging Point, 2 Port

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*Product available on Desertcart Egypt*
*Store origin: EG*
*Last updated: 2026-02-16*