---
product_id: 476106412
title: "Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black"
brand: "shimano"
price: "2250748₫"
currency: VND
in_stock: true
url: https://www.desertcart.vn/products/476106412-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long
store_origin: VN
region: Vietnam
---

# SGS Long Cage for max chain wrap Double Servo tech for precision 7/8 speed drivetrain compatibility Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black

**Brand:** shimano
**Price:** 2250748₫
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift into the future of smooth rides — don’t get left behind!

## Quick Answers

- **What is this?** Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black by shimano
- **How much does it cost?** 2250748₫ 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/476106412-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long)

## 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

Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black

## 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 |
|---------------|-------|
| UPC | 192790897738 |
| Color | Black |
| Size | SGS Long Cage |
| Material Type | Aluminum |
| Number of Items | 1 |
| Included Components | Rear Derailleur |
| Batteries Included? | No |
| Department | Rear Derailleur |
| Item model number | ERDM30208SGSL |
| Product Dimensions | 17.81 x 2.13 x 10.31 cm; 381 g |
| ASIN | B0BGFBSYQ3 |

## Product Details

- **Brand:** SHIMANO
- **Colour:** Black
- **Material:** Aluminum
- **Mounting type:** Braze-On Mount
- **Manufacturer:** SHIMANO

## Images

![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.

## 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

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**Shop now:** [https://www.desertcart.vn/products/476106412-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long](https://www.desertcart.vn/products/476106412-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long)

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-04-23*