---
product_id: 347740215
title: "XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black"
brand: "shimano"
price: "¥31033"
currency: JPY
in_stock: true
category: "Shimano"
url: https://www.desertcart.jp/products/347740215-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear
store_origin: JP
region: Japan
---

# Silent drivetrain tech 12-speed precision shifting Optimized for rugged trails XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black

**Brand:** shimano
**Price:** ¥31033
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift like a pro, ride like a legend.

## Quick Answers

- **What is this?** XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black by shimano
- **How much does it cost?** ¥31033 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/347740215-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear)

## 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

- • **Whisper-Quiet Ride:** Innovative chain stabilizer and rubber bumper reduce chain bounce and drivetrain noise for stealthy performance.
- • **High-Efficiency 13T Pulleys:** Durable sealed bearing pulleys cut friction and boost pedaling efficiency mile after mile.
- • **Effortless 12-Speed Shifting:** Experience lightning-fast, shockless gear changes that keep you ahead on every trail.
- • **Trail-Ready Low Profile Design:** Super sleek Shadow Plus silhouette minimizes snagging and maximizes durability on rough terrain.
- • **Built for Big Gears & Big Adventures:** Long cage supports up to 51T sprockets with 41T capacity, perfect for conquering steep climbs.

## Overview

The SHIMANO XT RD-M8100-SGS is a premium 12-speed long cage rear derailleur engineered for mountain bikers demanding fast, precise, and silent shifting. Featuring a low-profile Shadow Plus design, 13T sealed bearing pulleys, and advanced chain stabilization, it delivers smooth, efficient gear changes on the toughest trails. Built with durable alloy components and optimized for 1x drivetrains, it supports large sprockets up to 51T, making it the go-to choice for serious riders seeking performance and reliability.

## Description

XT Shadow plus 12-speed rear derailleur for fast and precise shifting performance optimized to take on any trailShadow plus features a super low profile design and optimized slant angle for super light shifting actionShadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shiftingSingle tension spring prevents contact with the chainstay resulting in a silent rideRubber bumper on pulley cage for added silent drive13T pulleys and decreased derailleur tension prevent high chain tension in low gearsDirect cable routing prevents snagging from any trail side hazardsCold forged wide alloy links and pivot bodyFour fluorine-coated link pin bushingsStrong return spring for a positive shifting feelSpecifically designed to work with 12-speed 1x drivetrainsDurable sealed 13T bearing pulleys for low frictionTop normal spring uses the spring to select higher gearsMax low sprocket: 51T (1x 12-speed)41T capacity SGS cageAverage weight 284g

## Features

- Fast, shockless shifting and low-profile design.
- Large 13T pulleys increase efficiency.
- Decreased tension in low gear and added bumper improve drivetrain silence.
- 12-speed rear.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07SWQZB46 |
| Best Sellers Rank | #52,307 in Sporting Goods ( See Top 100 in Sporting Goods ) #7 in Bike Front Dérailleurs |
| Brand Name | SHIMANO |
| Case Material Type | Aluminum |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (546) |
| Global Trade Identification Number | 04550170443641 |
| Included Components | Shimano Deore XT |
| Item Dimensions L x W x H | 17.8L x 17.8W x 12.7H centimeters |
| Item Type Name | Brakes & Shifters |
| Item Weight | 200 Grams |
| League Name | Shimano |
| Manufacturer | Shimano Deore XT |
| Manufacturer Part Number | 587830 |
| Material Type | Other |
| Model Number | 587830 |
| Mount Type | Braze-On Mount |
| Number of Teeth | 26 |
| UPC | 192790443645 |

## Product Details

- **Brand:** SHIMANO
- **Colour:** Black
- **Item weight:** 200 Grams
- **League:** Shimano
- **Material:** Other

## Images

![XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black - Image 1](https://m.media-amazon.com/images/I/51K46DNzSPL.jpg)

## Available Options

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

## Frequently Bought Together

- SHIMANO XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black
- Shimano XT SL-M8100-L Right Clamp-Band 12-Speed Shifter, Black
- SHIMANO Xt Cs-M8100 12-Speed Cassette

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**Shop now:** [https://www.desertcart.jp/products/347740215-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear](https://www.desertcart.jp/products/347740215-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-06-21*