---
product_id: 481941776
title: "ACERA Rear DERAIL 7/8-SPEED Long CAGE Black"
brand: "shimano"
price: "€ 51.74"
currency: EUR
in_stock: true
reviews_count: 13
category: "Shimano"
url: https://www.desertcart.it/products/481941776-acera-rear-derail-7-8-speed-long-cage-black
store_origin: IT
region: Italy
---

# SGS Long Cage for max chain wrap Double Servo tech for precision 7/8 speed compatibility ACERA Rear DERAIL 7/8-SPEED Long CAGE Black

**Brand:** shimano
**Price:** € 51.74
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift into the future with precision and power!

## Quick Answers

- **What is this?** ACERA Rear DERAIL 7/8-SPEED Long CAGE Black by shimano
- **How much does it cost?** € 51.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/481941776-acera-rear-derail-7-8-speed-long-cage-black)

## 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

- • **Built for Endurance:** Durable Shimano engineering backed by a 2-year warranty keeps your ride reliable season after season.
- • **Extended Chain Capacity:** SGS Long Cage design handles up to 45 teeth, perfect for tackling varied terrain without compromise.
- • **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, making upgrades and replacements hassle-free.
- • **Effortless Installation & Adjustment:** User-friendly design means quick setup and fine-tuning, so you spend less time wrenching and more time riding.

## 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 chain wrap capacity of 45 teeth, enabling versatile performance on diverse terrains. Built with Shimano’s renowned durability and backed by a 2-year warranty, this derailleur offers reliable, high-performance gear changes for both casual riders and cycling enthusiasts.

## 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: Nice derailleur for reasonable price - 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: Quality - Work good for my kids bike

## 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 | #98,414 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #32 in Rear Bike Derailleurs |
| Brand Name | SHIMANO |
| Customer Reviews | 4.7 4.7 out of 5 stars (167) |
| Date First Available | September 25, 2022 |
| Included Components | Rear Derailleur |
| Item Dimensions LxWxH | 7.01 x 0.84 x 4.06 inches |
| Item Package Dimensions L x W x H | 7.01 x 4.13 x 3.78 inches |
| Manufacturer | Shimano |
| Model Name | M3020 Acera |
| Number of Items | 1 |
| Package Weight | 0.38 Kilograms |
| Part Number | ERDM30208SGSL |
| Size | SGS Long Cage |
| Suggested Users | Rear Derailleur |
| UPC | 192790897738 |
| Warranty Description | 2 years |

## Product Details

- **Brand:** SHIMANO
- **Color:** Black
- **Item Weight:** 0.39 Kilograms
- **Material:** Aluminum
- **Mounting Type:** Braze-On Mount

## Images

![ACERA Rear DERAIL 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

### ⭐⭐⭐⭐⭐ Nice derailleur for reasonable price
*by J***F on July 14, 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.

### ⭐⭐⭐⭐⭐ Quality
*by D***S on December 7, 2025*

Work good for my kids bike

### ⭐⭐⭐⭐⭐ SHIMANO ACERA WORKS WELL
*by L***. on December 11, 2025*

yes this ia a real Shimano Derailleur i use it on my mtb have bought a few they get the job done without spending Mucho

## 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.it/products/481941776-acera-rear-derail-7-8-speed-long-cage-black](https://www.desertcart.it/products/481941776-acera-rear-derail-7-8-speed-long-cage-black)

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-21*