---
product_id: 216478948
title: "SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage"
brand: "shimano"
price: "$126"
currency: NZD
in_stock: true
reviews_count: 13
category: "Shimano"
url: https://www.desertcart.nz/products/216478948-shimano-black-erdm3100sgs-alivio-alivio-m3100-rear-derailleur-9-speed
store_origin: NZ
region: New Zealand
---

# SGS long cage for smooth chain management 9-speed precision shifting Shadow RD tech for impact resistance SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage

**Brand:** shimano
**Price:** $126
**Availability:** ✅ In Stock

## Summary

> 🚵‍♂️ Shift into adventure mode with Shimano’s stealthy precision!

## Quick Answers

- **What is this?** SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage by shimano
- **How much does it cost?** $126 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/216478948-shimano-black-erdm3100sgs-alivio-alivio-m3100-rear-derailleur-9-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

- • **Lightweight & Robust:** Crafted from durable aluminum, this derailleur balances strength and weight at just 0.4 kg, perfect for all-season mountain biking.
- • **Trail-Ready Durability:** Shadow RD technology’s ultra-flat profile minimizes damage from obstacles, keeping your ride uninterrupted and your derailleur protected.
- • **Effortless Installation:** Designed for quick, no-fuss fitting—even beginners can upgrade their bike with confidence and ease.
- • **Optimized Chain Control:** SGS long cage design ensures superior chain tension and stability, reducing wear and enhancing drivetrain longevity.
- • **Seamless 9-Speed Shifting:** Experience flawless gear transitions with Shimano’s HyperGlide system, engineered for silky smooth rides on every trail.

## Overview

The Shimano Alivio M3100 rear derailleur features a 9-speed HyperGlide system and Shadow RD technology with an SGS long cage, delivering durable, smooth, and precise gear changes. Its flat, impact-resistant design protects against trail hazards, while lightweight aluminum construction ensures reliable performance for mountain biking enthusiasts.

## Description

SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage : desertcart.co.uk: Sports & Outdoors

Review: Excellent replacement for scrapped gear set - Used these to replace the smashed ones when I fell off my bike. Took my time setting them up and used a new cable /chain and gear change is silky smooth.
Review: Great value - Easy to fit and for a complete noob whom can't elven ride so knows nothing about bikes but had to repair my sons it was simple and easy fit replacement

## 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 strike on the chain stay is prevented and even trail obstacles have hardly a chance of damaging the rear derailleur.
- The rear derailleur supports nine gear levels and the HyperGlide system, which protects the drive components from premature wear.
- Shimano

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08CGYD213 |
| Batteries included? | No |
| Best Sellers Rank | 11,056 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 7 in Bike Rear Dérailleurs |
| Bike type | Mountain Bike |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (612) |
| Date First Available | 30 May 2020 |
| Department | Unisex |
| Global Trade Identification Number | 04550170621155 |
| Included components | nothing |
| Is discontinued by manufacturer | No |
| Item model number | C8C086 |
| Manufacturer | SHIMANO |
| Material type | Aluminium |
| Number of items | 1 |
| Product dimensions | 17L x 11W x 10H centimetres |
| Seasons | All-Season |
| Size | One Size |
| Sport | Cycling |
| Style | Single |
| UPC | 192790621159 |
| Weight | 0.4 Kilograms |

## Product Details

- **Brand:** SHIMANO
- **Colour:** Black
- **Item weight:** 0.2 Kilograms
- **Material:** Aluminium
- **Mounting type:** Shimano Rear Direct Mount

## Images

![SHIMANO,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)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Would this work with a 42t cassette?**
A: Shimano are listing the max sprocket size as 36T. You may be able to get it to work on a 42T with a hanger extender.

**Q: Will this work on an 8 speed cassette**
A: It is designed for a 9 speed setup but should work fine on 8 speed also.

**Q: Would this work in 9 x 1 setup and how large can the cassette go?**
A: Yes it should be fine on a 1 x 9 setup, the max sprocket on the Shimano website is 45T

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent replacement for scrapped gear set
*by R***O on 8 December 2025*

Used these to replace the smashed ones when I fell off my bike. Took my time setting them up and used a new cable /chain and gear change is silky smooth.

### ⭐⭐⭐⭐⭐ Great value
*by S***E on 11 July 2025*

Easy to fit and for a complete noob whom can't elven ride so knows nothing about bikes but had to repair my sons it was simple and easy fit replacement

### ⭐⭐⭐⭐⭐ The Quality of product
*by B***N on 30 July 2025*

Very good derailed

## 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 New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-19*