--- product_id: 499632307 title: "Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black" brand: "shimano" price: "3556902₫" currency: VND in_stock: true reviews_count: 5 category: "Shimano" url: https://www.desertcart.vn/products/499632307-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed store_origin: VN region: Vietnam --- # SGS Long Cage, max 45T capacity Double Servo tech for precision 7/8 speed drivetrain compatible Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black **Brand:** shimano **Price:** 3556902₫ **Availability:** ✅ In Stock ## Summary > ⚙️ Shift Like a Pro, Ride Like a Legend ## Quick Answers - **What is this?** Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black by shimano - **How much does it cost?** 3556902₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/499632307-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed) ## 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 - • **Extended Gear Range:** SGS Long Cage design supports up to 45 teeth, giving you the freedom to tackle steep climbs and fast descents. - • **Lightweight Durability:** Crafted from premium aluminium, combining strength with minimal weight for peak performance. - • **Smooth Shifting Mastery:** Double Servo mechanism ensures ultra-precise gear changes, conquering any terrain with ease. - • **Versatile Compatibility:** Seamlessly works with both 7 and 8-speed drivetrains, perfect for upgrading or maintaining your ride. - • **Trusted Japanese Engineering:** Shimano’s renowned quality and reliability, backed by thousands of 5-star reviews worldwide. ## Overview The Shimano Acera RD-M3020-SGS Rear Derailleur features advanced Double Servo technology for smooth, precise shifting across 7 and 8-speed drivetrains. Its SGS Long Cage design supports a 45-tooth chain wrap capacity, ideal for versatile riding conditions. Made from durable aluminium and engineered in Japan, it offers reliable performance for cyclists seeking quality and value. ## Description The Shimano Acera RD-M3020 rear derailleur features Double Servo technology to provide smooth, precise shifting and helps you ride challenging terrain with fewer interruptions. Double Servo mechanism enables the rear derailleur to move in an optimum path Versatile performance and wide compatibility SGS Long cage Review: Calidad - Execelente Review: rapport qualite prix excellent - excellent produit facile a ajuster parfait pour mon vieux gary fisher monona 2008 ## Features - Double Servo mechanism enables the rear derailleur to move in an optimum path - Versatile performance and wide compatibility - SGS Long cage - Chain Wrap Capacity (teeth): 45 - Drivetrain Speeds: 7,8 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BGFBSYQ3 | | Best Sellers Rank | 381,682 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 422 in Bike Rear Dérailleurs | | Brand | SHIMANO | | Brand Name | SHIMANO | | Case Material Type | Aluminium | | Colour | Black | | Customer Reviews | 4.7 out of 5 stars 182 Reviews | | Included Components | Rear Derailleur | | Item Weight | 0.39 Kilograms | | Item weight | 0.39 Kilograms | | Manufacturer | SHIMANO | | Manufacturer Part Number | ERDM30208SGSL | | Material | Aluminium | | Material Type | Aluminium | | Model Number | ERDM30208SGSL | | Mount Type | Braze-On Mount | | Mounting type | Braze-On Mount | | Number of Teeth | 45 | | UPC | 192790897738 | ## Product Details - **Brand:** SHIMANO - **Colour:** Black - **Manufacturer:** SHIMANO - **Material:** Aluminium - **Mounting type:** Braze-On Mount ## Images ![Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black - Image 1](https://m.media-amazon.com/images/I/61LquuwOcdL.jpg) ## Questions & Answers **Q: Will this replace stx rc?** A: Yes it will as long as your low sprocket on your cassette is as least a 30t. There are cheaper Shimano derailleurs that will also work. What makes this one special is it can be used on a 1x setup with a 11-40T cassette. **Q: Will this replace an sis megarange?** A: A highly qualified "Yes". Be prepared to become a self-taught expert in bicycle derailleurs in the process. Expect to discover that you need other parts, such as a hanger-adapter. You will almost certainly need to replace your shifter cable and housing, as the cable entry is different, necessitating rerouting, and hence a different length cable and housing. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Calidad *by J***7 on 16 February 2025* Execelente ### ⭐⭐⭐⭐⭐ rapport qualite prix excellent *by J***U on 1 May 2026* excellent produit facile a ajuster parfait pour mon vieux gary fisher monona 2008 ### ⭐⭐⭐⭐⭐ Nice derailleur for reasonable price *by J***F on 14 July 2025* Works great on my wife’s bike after adjusting. Can handle larger cassette than older Acera Derailleur. Shift well. Using on a 1 by 8 speed cassette, shout also work with a 2 or 3 speed front derailleur. ## Frequently Bought Together - Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black - KMC Chain 8SP X8-Silver/Grey - X8.93 - SHIMANO Unisex Cshg4008140 CS HG400 8 Speed Cassette 11 40T, Silver, 40 Teeth UK --- ## 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.vn/products/499632307-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed](https://www.desertcart.vn/products/499632307-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-06-04*