---
product_id: 155102350
title: "XT RD-M8100-SGS RD-M8120-SGS 12-Speed Rear Derailleur, Long Cage, Black"
brand: "shimano"
price: "₩328559"
currency: KRW
in_stock: true
reviews_count: 13
category: "Shimano"
url: https://www.desertcart.kr/products/155102350-xt-rd-m8100-sgs-rd-m8120-sgs-12-speed-rear
store_origin: KR
region: South Korea
---

# 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:** ₩328559
**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?** ₩328559 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/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

- • **Durable Long Cage Design:** Handle the toughest terrains with a robust long cage that supports wide gear ranges.
- • **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.
- • **Proven Reliability & Easy Setup:** Trusted by riders for over 10,000 miles, with hassle-free installation and tuning.
- • **Maximized Efficiency with 13T Pulleys:** Large pulleys reduce friction, delivering smoother rides and less energy loss.

## Overview

The SHIMANO XT RD-M8100-SGS is a high-performance 12-speed rear derailleur featuring a long cage design for wide gear compatibility. It boasts large 13T pulleys for enhanced efficiency, shockless and fast shifting, and a noise-reducing bumper for silent operation. Renowned for durability and ease of installation, it’s a top choice for serious cyclists seeking reliable, smooth drivetrain performance.

## Description

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

Review: Simple, Reliable and Great Value - It doesn’t get much better for reliability and cost. My last unit lasted 10k miles plus. Super easy to install and tune, extremely smooth shifting.
Review: Works no mater what the conditions!! - Solid. works like a champ!

## 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 | #74,926 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #25 in Rear Bike Derailleurs |
| Brand Name | SHIMANO |
| Customer Reviews | 4.7 4.7 out of 5 stars (496) |
| Date First Available | July 20, 2019 |
| Global Trade Identification Number | 04550170443641 |
| Included Components | Rear Derailleur |
| Item Dimensions LxWxH | 7 x 7 x 5 inches |
| Item Package Dimensions L x W x H | 7.48 x 5.67 x 2.72 inches |
| Manufacturer | Shimano |
| Model Name | 587830 |
| Model Year | 2019 |
| Mounting Type | Braze-On Mount |
| Number of Items | 1 |
| Package Weight | 0.19 Kilograms |
| Part Number | 587830 |
| Product Dimensions | 7"L x 7"W x 5"H |
| Size | 1x12 |
| Sport Type | Cycling |
| Style | Flat |
| Suggested Users | unisex-adult |
| UPC | 192790443645 |
| Warranty Description | 90 Day Limited |

## Product Details

- **Brand:** SHIMANO
- **Color:** Black/Gray
- **Item Weight:** 6.72 ounces
- **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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simple, Reliable and Great Value
*by R***T on June 23, 2025*

It doesn’t get much better for reliability and cost. My last unit lasted 10k miles plus. Super easy to install and tune, extremely smooth shifting.

### ⭐⭐⭐⭐⭐ Works no mater what the conditions!!
*by D***H on December 27, 2025*

Solid. works like a champ!

### ⭐⭐⭐⭐⭐ Works good
*by M***7 on December 8, 2025*

Works just fine. Had a more expensive one on there before, but this one works just as well.

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

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-05*