--- product_id: 510595219 title: "SHIMANO Internal 2-Port Junction for EW-SD300 - IEWJC302" brand: "shimano" price: "$66.16" currency: USD in_stock: true reviews_count: 5 url: https://www.desertcart.us/products/510595219-shimano-internal-2-port-junction-for-ew-sd300-iewjc302 store_origin: US region: United States of America --- # SHIMANO Internal 2-Port Junction for EW-SD300 - IEWJC302 **Brand:** shimano **Price:** $66.16 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** SHIMANO Internal 2-Port Junction for EW-SD300 - IEWJC302 by shimano - **How much does it cost?** $66.16 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/510595219-shimano-internal-2-port-junction-for-ew-sd300-iewjc302) ## Best For - shimano enthusiasts ## Why This Product - Trusted shimano brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Optimize your Di2 electronic shifting system with the EW-JC302 Di2 Junction Box - a high-performance, reliable, and versatile component designed for seamless integration and advanced cycling precision. Crafted from durable, materials, this junction box features two ports, making it ideal for streamlined wiring configurations and efficient electronic component management. Engineered for superior performance, the EW-JC302 integrates effortlessly with 's cutting-edge EW-SD300 E-tube wiring system, connecting crucial bike components such as the front and rear derailleurs, cockpit junction box, and battery mount. Its advanced engineering ensures consistent, responsive shifting with minimal maintenance, powered by the sophisticated Di2 digital electronic technology. Featuring intelligent components and technology, this junction box maintains compatibility across all Di2 components by using a unified firmware version, helping prevent malfunctions and ensuring optimal system operation. The unit supports firmware updates via the Di2 system checker available at 's official E-tube Project platform, keeping your electronic shifting system up-to-date with the latest features and improvements. Designed with style and use-case versatility in mind, the EW-JC302 Junction Box is ideal for road, mountain, and gravel cyclists seeking a clean, professional setup that enhances their bike's performance and reliability. Its compact, sleek profile allows for easy integration into your bike frame, maintaining a tidy cockpit and optimal cable management. Key Features: - Connects via SD50 E-tube wires to front derailleur, rear derailleur, cockpit junction box, and battery mount - Durable, materials for long-lasting performance and reliability - Supports firmware updates to ensure system stability and compatibility - Compatible with Di2 EW-SD300 wiring system - Compact, sleek design tailored for various cycling dis ## Features - Constructed from , durable plastic and cable management materials, the EW-JC302 Di2 Junction Box ensures reliable performance and longevity in all weather conditions. - Engineered for seamless integration with 's Electronic shifting systems, this junction box provides robust connectivity with two ports for efficient wiring and minimal cable clutter. - Featuring advanced E-tube technology, the EW-JC302 allows for precise signal transmission between front and rear derailleurs, cockpit controls, and the battery, optimizing shifting performance and reliability. - Designed for road, mountain, and commuter bikes, this junction box offers a clean, streamlined aesthetic while supporting easy installation and maintenance for a variety of cycling disciplines. - Includes firmware compatibility management, ensuring smooth synchronization with all Di2 components through firmware updates via the Di2 system checker, preventing malfunctions and enhancing performance. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B093NL1K8H | | Brand Name | SHIMANO | | Capacity | 1 Fluid ounces | | Colour | Black | | Customer Reviews | 4.6 4.6 out of 5 stars (49) 4.6 out of 5 stars | | Finish Type | Natural | | Included Components | Junction Box | | Installation Type | Screw-In | | Manufacturer | SHIMANO | | Material | Aluminium | | Model Number | EW-JC302 | | Number Of Items | 1 | | Number Of Packs | 1 | | Part Number | IEWJC302 | | Style | Junction Box | | Upc | 192790597188 | ## Product Details - **Brand:** SHIMANO - **Color:** black - **Material:** Aluminum - **Case Material:** Aluminum - **Mounting Type:** Handlebar Mount ## Images ![SHIMANO Internal 2-Port Junction for EW-SD300 - IEWJC302 - Image 1](https://m.media-amazon.com/images/I/41wkeRM-cyL.jpg) ![SHIMANO Internal 2-Port Junction for EW-SD300 - IEWJC302 - Image 2](https://m.media-amazon.com/images/I/31f5d+D2-NL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Connector needed *by on Reviewed in the United States 2 February 2026* Cable plus connector pair to update software. Worked well. ### ⭐⭐⭐⭐⭐ Works and saves a trip to the bike shop *by on Reviewed in the United States 17 November 2025* Worked perfectly to update the firmware on my DI2 9200 shifters. I connected the cable from the front mech to the upgrade cable with this connector and the ETube app saw the shifter and updated it. Easy peasy. ### ⭐⭐⭐⭐⭐ Worked *by on Reviewed in the United States 12 July 2025* I updated the firmware in my Ultrega 12-speed Di2 shifters using this junction and a Di2 cable "SHIMANO 2Nd Gen E-Tube Di2 Wire Ew-Sd300, 1400Mm". I'm a bit disappointed in Shimano that a wired connection is needed to update, though. ## Frequently Bought Together - SHIMANO 2 PORT JUNCTION EW JC302 SD300 PORT X 2 - SHIMANO 2Nd Gen E-Tube Di2 Wire - SHIMANO Cycling Y7HE40000 TL-EW300 Cable Tool - Replacement Spare Parts for Bike --- ## 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.us/products/510595219-shimano-internal-2-port-junction-for-ew-sd300-iewjc302](https://www.desertcart.us/products/510595219-shimano-internal-2-port-junction-for-ew-sd300-iewjc302) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-09-29*