--- product_id: 476106412 title: "Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black" brand: "shimano" price: "VT42177" currency: VUV in_stock: true reviews_count: 5 url: https://www.desertcart.vu/products/476106412-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed store_origin: VU region: Vanuatu --- # SGS Long Cage for max chain wrap Double Servo tech for precision 7/8 speed drivetrain compatibility Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black **Brand:** shimano **Price:** VT42177 **Availability:** ✅ In Stock ## Summary > ⚙️ Shift into the future of smooth rides — don’t get left behind! ## 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?** VT42177 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/476106412-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 - • **Effortless Upgrade:** Plug-and-play rear derailleur that fits a broad range of bikes, elevating your ride instantly. - • **Lightweight Durability:** Crafted from robust aluminum, balancing strength and minimal weight at just 381g. - • **Extended Chain Capacity:** SGS Long Cage design supports up to 45 teeth, perfect for versatile riding styles and steep climbs. - • **Smooth Shifting Mastery:** Double Servo mechanism ensures ultra-precise gear changes, conquering any terrain with ease. - • **Wide Speed Compatibility:** Seamlessly works with both 7 and 8-speed drivetrains, maximizing your bike’s adaptability. ## Overview The Shimano Acera RD-M3020-SGS Rear Derailleur features advanced Double Servo technology for precise shifting, a long cage design supporting up to 45 teeth chain wrap, and compatibility with 7 and 8-speed drivetrains. Made from durable aluminum and weighing only 381g, it offers a reliable, lightweight upgrade for versatile cycling performance. ## Description The Shimano Acera RD-M3020 rear shift features Double Servo technology for smooth and precise changes and helps you walk on challenging terrain with less disruption. Dual servo mechanism allows the rear shift to move in an ideal path. Versatile performance and wide compatibility. SGS Long Cage Review: Execelente Review: I have a Fuji Sunfire hybrid bicycle. Long time ago the original derailleur was damaged and somebody in the bike shop told me to get Deore Derailleur because it is considered to be higher end. At that time I did not realize that the Deore is for another speed count and struggled for years as it did not shift correctly. Finally started to research and found the Acera is the one that fits my bicycle. Got this one, installed and suddenly the bicycle is shifting good, running good and does not make any problems anymore. ## 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 | #87,574 in Sporting Goods ( See Top 100 in Sporting Goods ) #106 in Bike Shifters & Parts | | Brand Name | SHIMANO | | Case Material Type | Aluminum | | Color | black / black | | Customer Reviews | 4.7 4.7 out of 5 stars (179) | | Included Components | Rear Derailleur | | Item Weight | 0.39 Kilograms | | Manufacturer | SHIMANO | | Manufacturer Part Number | ERDM30208SGSL | | Material Type | Aluminum | | Model Number | ERDM30208SGSL | | Mount Type | Braze-On Mount | | Number of Teeth | 45 | | UPC | 192790897738 | ## Product Details - **Brand:** SHIMANO - **Colour:** black / black - **Item weight:** 0.39 Kilograms - **Material:** Aluminum - **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 ### ⭐⭐⭐⭐⭐ Review *by J***7 on 16 February 2025* Execelente ### ⭐⭐⭐⭐⭐ Review *by T***R on 14 January 2024* I have a Fuji Sunfire hybrid bicycle. Long time ago the original derailleur was damaged and somebody in the bike shop told me to get Deore Derailleur because it is considered to be higher end. At that time I did not realize that the Deore is for another speed count and struggled for years as it did not shift correctly. Finally started to research and found the Acera is the one that fits my bicycle. Got this one, installed and suddenly the bicycle is shifting good, running good and does not make any problems anymore. ### ⭐⭐⭐⭐⭐ Review *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.vu/products/476106412-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed](https://www.desertcart.vu/products/476106412-shimano-acera-rd-m3020-sgs-rear-derailleur-7-8-speed) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-04*