--- product_id: 2424832 title: "Shimano Ultegra Di2 Internal Routing Junction Box" brand: "shimano" price: "Rp998557" currency: IDR in_stock: true reviews_count: 8 category: "Shimano" url: https://www.desertcart.id/products/2424832-shimano-ultegra-di2-internal-routing-junction-box store_origin: ID region: Indonesia --- # Instant Di2 connectivity Seamless internal routing Ultra-light 13.6g weight Shimano Ultegra Di2 Internal Routing Junction Box **Brand:** shimano **Price:** Rp998557 **Availability:** ✅ In Stock ## Summary > ⚡ Power your ride with invisible precision! ## Quick Answers - **What is this?** Shimano Ultegra Di2 Internal Routing Junction Box by shimano - **How much does it cost?** Rp998557 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/products/2424832-shimano-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 - • **Durability Guaranteed:** Backed by Shimano’s trusted 2-year manufacturer warranty - • **Effortless Integration:** Plug-and-play design for Ultegra Di2 6770, 6870 & Dura-Ace 9070 systems - • **Sleek Internal Routing:** Conceal your cables inside the frame for a clean, professional build - • **Upgrade Your Shift Game:** Essential for ditching mechanical cables and embracing precision electronic shifting - • **Featherlight Performance:** Weighs just 13.6 grams to keep your ride lightning fast ## Overview The Shimano Ultegra Di2 Internal Routing Junction Box (SM-JC41) is a lightweight, compact hub that connects all Di2 electronic shifting wires inside your bike frame. Compatible with Ultegra 6770, 6870, and Dura-Ace 9070 groupsets, it enables a clean, professional internal cable setup, enhancing both aesthetics and performance. With a mere 13.6g weight and a 2-year warranty, it’s the must-have upgrade for serious cyclists seeking flawless electronic shifting. ## 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: Internal wiring junction box - picture is wrong - 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!! ## 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 | #373,261 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #218 in Bike Cables | | Brand Name | SHIMANO | | Color | One Color | | Customer Reviews | 4.3 4.3 out of 5 stars (60) | | 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 ![Shimano Ultegra Di2 Internal Routing Junction Box - Image 1](https://m.media-amazon.com/images/I/51UT4AB5t5L.jpg) ![Shimano Ultegra Di2 Internal Routing Junction Box - Image 2](https://m.media-amazon.com/images/I/4116goo9QVL.jpg) ![Shimano Ultegra Di2 Internal Routing Junction Box - Image 3](https://m.media-amazon.com/images/I/41Hn1oLZQeL.jpg) ![Shimano Ultegra Di2 Internal Routing Junction Box - Image 4](https://m.media-amazon.com/images/I/51A70FLdWxL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Brand new. *by S***S on October 14, 2025* A must. ### ⭐⭐⭐⭐⭐ 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!! ### ⭐⭐⭐⭐⭐ expensive but functional *by C***S on December 28, 2022* It is an expensive item for its size but essential to install Di2 ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.id/products/2424832-shimano-ultegra-di2-internal-routing-junction-box](https://www.desertcart.id/products/2424832-shimano-ultegra-di2-internal-routing-junction-box) --- *Product available on Desertcart Indonesia* *Store origin: ID* *Last updated: 2026-04-25*