---
product_id: 499632307
title: "Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black"
brand: "shimano"
price: "€ 83.67"
currency: EUR
in_stock: true
reviews_count: 5
category: "Shimano"
url: https://www.desertcart.nl/products/499632307-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long
store_origin: NL
region: Netherlands
---

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

**Brand:** shimano
**Price:** € 83.67
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift into the future with Shimano’s precision power!

## Quick Answers

- **What is this?** Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black by shimano
- **How much does it cost?** € 83.67 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/499632307-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

- • **Long Cage Power:** SGS Long Cage design handles up to 45 teeth chain wrap capacity, ideal for tackling varied terrain with confidence.
- • **Wide Compatibility:** Works flawlessly with 1x, 2x, or 3x front derailleurs, giving you the freedom to optimize your drivetrain.
- • **Durable & Lightweight:** Crafted from premium aluminium, combining strength with a featherlight 390g build for peak performance.
- • **Smooth Shifting Mastery:** Double Servo mechanism ensures ultra-precise gear changes, so you never miss a beat on your ride.
- • **Versatile Speed Compatibility:** Seamlessly supports 7 and 8-speed drivetrains, perfect for upgrading or customizing your bike setup.

## 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 high chain wrap capacity of 45 teeth, making it ideal for diverse riding conditions. Built from durable aluminium and weighing just 390g, it offers versatile compatibility with multiple front derailleur setups, ensuring reliable performance for both casual and challenging rides.

## 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: Execelente
Review: 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.

## 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 |
| Batteries included? | No |
| Best Sellers Rank | 370,756 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 379 in Bike Rear Dérailleurs |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (164) |
| Date First Available | 30 Sept. 2022 |
| Department | Rear Derailleur |
| Included components | Rear Derailleur |
| Item model number | ERDM30208SGSL |
| Manufacturer | SHIMANO |
| Material type | Aluminium |
| Number of items | 1 |
| Product Dimensions | 17.81 x 2.13 x 10.31 cm; 390 g |
| Size | SGS Long Cage |
| UPC | 192790897738 |

## Product Details

- **Brand:** SHIMANO
- **Colour:** Black
- **Item weight:** 0.39 Kilograms
- **Material:** Aluminium
- **Mounting type:** Braze-On Mount

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***7 on 16 February 2025*

Execelente

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Review
*by A***A on 6 July 2025*

Schaltwerk fahrad

## 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.nl/products/499632307-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long](https://www.desertcart.nl/products/499632307-acera-rd-m3020-sgs-rear-derailleur-7-8-speed-long)

---

*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-11*