---
product_id: 155102350
title: "XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black"
brand: "shimano"
price: "¥32096"
currency: JPY
in_stock: true
category: "Shimano"
url: https://www.desertcart.jp/products/155102350-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear
store_origin: JP
region: Japan
---

# Silent drivetrain with bumper Long cage for wide gear range 12-speed precision shifting XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black

**Brand:** shimano
**Price:** ¥32096
**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?** ¥32096 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/155102350-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

- • **Sleek Low-Profile Design:** Modern aesthetics meet functional engineering for a clean, professional look.
- • **Whisper-Quiet Performance:** Innovative bumper and reduced tension minimize drivetrain noise for a stealthy ride.
- • **Effortless 12-Speed Shifting:** Experience lightning-fast, shockless gear changes that keep you ahead of the pack.
- • **Durable Alloy Steel & Aluminum Build:** Lightweight yet robust materials ensure long-lasting performance on every trail.
- • **Maximized Efficiency with 13T Pulleys:** Large pulleys reduce friction, delivering smoother rides and less energy loss.

## Overview

The Shimano Deore XT RD-M8100-SGS is a high-performance 12-speed long cage rear derailleur engineered for fast, silent, and efficient shifting. Featuring large 13T pulleys and a low-profile design, it offers durability with lightweight alloy steel and aluminum construction, making it a top choice for serious cyclists seeking precision and reliability.

## Description

desertcart.com : Deore XT RD-M8100 SGS Rear Derailleur, 12-speed, Black/Gray | rear-bike-derailleurs : Sports & Outdoors

## 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 | #102,598 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #48 in Rear Bike Derailleurs |
| Brand Name | SHIMANO |
| Case Material Type | Alloy Steel |
| Color | Black/Gray |
| Customer Reviews | 4.7 4.7 out of 5 stars (531) |
| Global Trade Identification Number | 04550170443641 |
| Included Components | Rear Derailleur |
| Item Dimensions L x W x H | 7"L x 7"W x 5"H |
| Item Type Name | Rear Derailleur |
| Item Weight | 200 Grams |
| League Name | Shimano |
| Manufacturer | Shimano |
| Manufacturer Part Number | 587830 |
| Material Type | Aluminum |
| Model Number | 587830 |
| Mount Type | Braze-On Mount |
| Number of Teeth | 51 |
| UPC | 192790443645 |
| Unit Count | 1.0 Count |
| Warranty Description | 90 Day Limited |

## Product Details

- **Brand:** SHIMANO
- **Color:** Black/Gray
- **Item Weight:** 200 Grams
- **League:** Shimano
- **Material:** Aluminum

## 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/155102350-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear](https://www.desertcart.jp/products/155102350-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-07-07*