---
product_id: 241101188
title: "Black,ERDM3100SGS Alivio Alivio M3100 Rear derailleur, 9-Speed, Shadow Design, SGS Long cage"
brand: "shimano"
price: "R1329"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Shimano"
url: https://www.desertcart.co.za/products/241101188-black-erdm3100sgs-alivio-alivio-m3100-rear-derailleur-9-speed-shadow
store_origin: ZA
region: South Africa
---

# 9-Speed precision shifting Shadow RD tech for derailleur protection SGS Long cage for smooth chain management Black,ERDM3100SGS Alivio Alivio M3100 Rear derailleur, 9-Speed, Shadow Design, SGS Long cage

**Brand:** shimano
**Price:** R1329
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Shift into adventure mode with Shimano’s Alivio M3100 – where precision meets rugged trail mastery!

## Quick Answers

- **What is this?** Black,ERDM3100SGS Alivio Alivio M3100 Rear derailleur, 9-Speed, Shadow Design, SGS Long cage by shimano
- **How much does it cost?** R1329 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/241101188-black-erdm3100sgs-alivio-alivio-m3100-rear-derailleur-9-speed-shadow)

## 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

- • **Trail-Ready Durability:** Shadow RD technology’s ultra-flat design minimizes damage from trail obstacles—ride harder, worry less.
- • **Effortless Installation:** Designed for quick setup with basic tools, get back on the trail faster without hassle.
- • **Optimized Chain Control:** SGS Long cage ensures superior chain tension and stability, perfect for aggressive climbs and descents.
- • **Trusted Shimano Quality:** Backed by a 2-year manufacturer warranty and glowing reviews, this derailleur delivers reliable performance in all conditions.
- • **Seamless 9-Speed Shifting:** Experience flawless gear transitions with Shimano’s HyperGlide system, keeping your ride smooth and efficient.

## Overview

The Shimano Alivio ERDM3100SGS rear derailleur features 9-speed HyperGlide shifting and Shadow RD technology for enhanced durability and protection on rough trails. Its SGS long cage design optimizes chain tension for smooth gear changes, making it ideal for trail and trekking cyclists seeking reliable, high-performance drivetrain components.

## Description

desertcart.com : Shimano Unisex – Adult's Alivio Rd-m3100 Rear derailleur, Black, Standard Size : Sports & Outdoors

Review: Quality and ease of set up - This was a true Shimano Derailleur, I have order some before and they were packed in Shimano packaging and were off brand. It worked for my son’s bike. Price and performance are good for a kids bike that will end up taking a beating. Easy to install with some basic tools. Once dialed in it shifts like it should.
Review: Good replacement for OEM - I run this on my Fuji mountain bike in good and bad weather. On and off road. I use ALL my gears because I keep my cadence up during steep climbs and single track ups and downs. This rear derailleur does fine by me. My quick and multiple gear changes are good even under stressed conditions such as twisty uphill changes. I do not race but I do abuse my bikes for maximum fun. If you must replace your rear derailleur, be sure you haven't bent the rear dropout.

## Features

- The Shimano Alivio rear derailleur with Shadow RD technology is even better than its predecessor for trail and trekking use
- Thanks to the very flat design and the optimised spring tension, a stop on the chain stay is prevented and even trail obstacles have hardly a chance to damage the rear derailleur.
- The rear derailleur supports nine gear levels and the HyperGlide system which protects the drive components from premature wear.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08CGYD213 |
| Best Sellers Rank | #113,868 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #44 in Rear Bike Derailleurs |
| Brand Name | SHIMANO |
| Customer Reviews | 4.4 4.4 out of 5 stars (613) |
| Date First Available | May 30, 2020 |
| Global Trade Identification Number | 04550170621155 |
| Included Components | Bike Parts |
| Item Dimensions LxWxH | 6.69 x 4.33 x 3.94 inches |
| Item Package Dimensions L x W x H | 7.83 x 4.72 x 4.21 inches |
| Manufacturer | Shimano |
| Model Name | C8C086 |
| Model Year | 2021 |
| Number of Items | 1 |
| Package Weight | 0.38 Kilograms |
| Part Number | ERDM3100SGS |
| Product Dimensions | 6.69"L x 4.43"W x 3.94"H |
| Size | Standard |
| Sport Type | Cycling |
| Style | Single |
| Suggested Users | unisex |
| UPC | 192790621159 |
| Warranty Description | 2 Year Manufacturer |

## Product Details

- **Brand:** SHIMANO
- **Color:** Black
- **Item Weight:** 0.2 Kilograms
- **Material:** other
- **Mounting Type:** Braze-On Mount

## Images

![Black,ERDM3100SGS Alivio Alivio M3100 Rear derailleur, 9-Speed, Shadow Design, SGS Long cage - Image 1](https://m.media-amazon.com/images/I/51x63EFYbSL.jpg)

## Questions & Answers

**Q: sirve para 2x9 de 11-40?**
A: Trabaja bien para 3*9

**Q: Is this compatible for 8 speed?**
A: Not perfectly - the m3100 model is really meant for 9 speed

**Q: Will this replace the stx rc on a Trek 7300 8 speed?**
A: Shimano's Compatibility charts won't show this "9-speed" derailleur as compatible with 8-speed components, but it should work just fine. Shimano 8-speed shifters will work. This RD can handle larger cogs than were common in the 8-speed era, up to 36t largest cog, but assuming you have 11-32 it'll work. I have an stx rc RD on one of my bikes, and wouldn't hesitate to try this as a replacement.

**Q: Does it come with the hanger bolt?**
A: Hi - It does not.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality and ease of set up
*by C***S on December 29, 2025*

This was a true Shimano Derailleur, I have order some before and they were packed in Shimano packaging and were off brand. It worked for my son’s bike. Price and performance are good for a kids bike that will end up taking a beating. Easy to install with some basic tools. Once dialed in it shifts like it should.

### ⭐⭐⭐⭐⭐ Good replacement for OEM
*by C***H on September 3, 2025*

I run this on my Fuji mountain bike in good and bad weather. On and off road. I use ALL my gears because I keep my cadence up during steep climbs and single track ups and downs. This rear derailleur does fine by me. My quick and multiple gear changes are good even under stressed conditions such as twisty uphill changes. I do not race but I do abuse my bikes for maximum fun. If you must replace your rear derailleur, be sure you haven't bent the rear dropout.

### ⭐⭐⭐⭐ 9 speed cassette review
*by J***N on October 23, 2025*

Seems to work well, also seems to be of better quality than the original one .

## Frequently Bought Together

- Shimano,Black,ERDM3100SGS Alivio Alivio M3100 Rear derailleur, 9-Speed, Shadow Design, SGS Long cage
- SHIMANO Alivio SL-M3100 Alivio Shift Lever, 9-Speed, Band on, Right Hand,Black

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-01-29*