# Rear derailleur Shimano Alivio RD-M3100 9-speed, long cage, black

**URL:** https://aio.lv/en/product--shimano-erdm3100sgs--11395198
**Data updated:** 2026-02-14 19:46 (EET)
**Category:** Bicycle accessories
**Manufacturer:** Shimano
**Manufacturer code:** ERDM3100SGS
**EAN:** 4550170621155
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

Shimano Alivio RD-M3100 rear derailleur for 9-speed drivetrains, finished in black with a long-cage design. Designed to deliver reliable shifting performance for mountain and trekking bikes, it handles a wide gear range and larger cassettes. Suitable for replacement or upgrade, it provides consistent chain management and durable operation on varied terrain.

## Long description

The Shimano Alivio RD-M3100 rear derailleur is a 9-speed, long-cage derailleur finished in black and engineered for mountain and trekking bicycles. It supports a wide gear range and larger cassettes, offering stable chain management and consistent shifting across varied terrain. The design emphasizes durability and dependable performance for both replacement and upgrade applications, integrating with Shimano 9-speed drivetrains to maintain smooth gear changes under load.
Advantages
The long-cage configuration accommodates larger sprockets and a broad cassette range while maintaining proper chain tension. Construction materials and Shimano's design provide reliable shifting accuracy and extended service life even in demanding off-road or mixed-surface conditions. The unit is compatible with standard Shimano shift systems for straightforward installation and adjustment, delivering predictable gear transitions and minimal maintenance requirements.
Suitable for
 Mountain biking on varied terrain
 Trekking and touring with wide-range cassettes
 Replacement of worn or damaged 9-speed rear derailleurs
 Upgrading older drivetrains to improved chain management
 Use on bicycles requiring long-cage capacity for larger sprockets
Key specifications
 Speed compatibility: 9-speed drivetrains
 Cage type: long cage for increased chain capacity
 Finish: black
 Function: rear derailleur for mountain/trekking use
 Mount type: hanger-mounted rear derailleur
How to use
Install the derailleur on a compatible derailleur hanger and connect to a Shimano 9-speed shifter using the correct cable and housing. Adjust high and low limit screws to set the lateral travel range and fine-tune cable tension to achieve precise indexing across the cassette. Ensure jockey wheels are aligned and the B-tension screw is set so the upper pulley maintains appropriate distance from the largest sprocket. After initial setup, test shifts under load and make small tension or limit adjustments as needed for smooth operation.
Usage recommendations
For reliable performance, use with a properly sized cassette and chain rated for 9-speed systems, keep the derailleur and jockey wheels free of excessive dirt and debris, and periodically check cable condition and tension. When replacing a rear derailleur, verify hanger alignment and compatibility with your frame to ensure precise shifting and longevity.

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### What is the warranty period?

All Shimano products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Shimano service centers and through AiO.lv

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