---
product_id: 204469439
title: "microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black"
brand: "microshift"
price: "B/.54"
currency: PAB
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.pa/products/204469439-microshift-m21-rear-derailleur-6-7-speed-super-short-cage
store_origin: PA
region: Panama
---

# 241g lightweight design High-strength composite & steel 6-7 speed compatible microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black

**Brand:** microshift
**Price:** B/.54
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift Smarter, Ride Faster – Upgrade Your Ride with microSHIFT M21!

## Quick Answers

- **What is this?** microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black by microshift
- **How much does it cost?** B/.54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/204469439-microshift-m21-rear-derailleur-6-7-speed-super-short-cage)

## Best For

- microshift enthusiasts

## Why This Product

- Trusted microshift brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Durable composite and steel construction ensures long-lasting performance in all conditions.
- • **Sleek & Stealthy:** Matte black finish combines style with corrosion resistance for a premium look and feel.
- • **Light as a Feather:** At just 241 grams, it boosts agility without weighing you down.
- • **Seamless Compatibility:** Works flawlessly with both mountain and road bike shifters for versatile upgrades.
- • **Precision Shifting Mastery:** Super short cage for rapid, smooth gear changes across 6-7 speed setups.

## Overview

The microSHIFT M21 Rear Derailleur is a lightweight, durable, and precision-engineered component designed for 6- and 7-speed road and mountain bikes. Featuring a super short cage and a max cog size of 32 teeth, it delivers fast, reliable shifting with a sleek black finish that resists corrosion. Compatible with a wide range of drivetrains, it’s the perfect upgrade for riders seeking enhanced performance and style across diverse terrains.

## Description

Boost Your Bike's Performance with the microSHIFT M21 Rear Derailleur - 6 & 7-Speed, Super Short Cage, Black Upgrade your cycling setup with the microSHIFT M21 Rear Derailleur, engineered for versatility, durability, and smooth shifting. Designed to work seamlessly with 6- and 7-speed road and mountain bike systems, the M21 rear derailleur is the perfect choice for cyclists seeking reliable performance across various terrains and riding styles. Materials & Construction: Constructed with robust composite materials combined with high-strength steel components, the M21 derailleur offers exceptional durability and lightweight performance. Its corrosion-resistant black finish not only enhances the aesthetic appeal but also ensures longevity in diverse weather conditions, making it ideal for everyday commuting, mountain biking, or gravel adventures. Performance & Engineering: Featuring a super short cage design, the M21 derailleur provides precise gear indexing and rapid shifting response, especially suited for bikes with a 32-tooth largest cog. The optimized engineering ensures optimal chain wrap capacity of 21 teeth, reducing chain slack and minimizing derailleur noise for a quieter, more efficient ride. Its innovative design guarantees smooth transition between gears, even during aggressive riding or rough terrain. Components & Technology: Equipped with a 10x1 standard rear derailleur mount and compatible with 6- and 7-speed systems, the M21 offers effortless installation and compatibility with a wide array of bikes. Whether you ride a mountain bike, road bike, or hybrid, this derailleur provides dependable performance with easy-to-adjust components for maintenance and tuning. Style & Use Case: The sleek black finish and compact profile make the microSHIFT M21 rear derailleur both stylish and functional. Its lightweight (just 241 grams) construction makes it suitable for riders prioritizing agility and speed. Perfect for upgrading existing bikes or bui

## Features

- Ideal for 6- and 7-speed road and mountain bike systems, the microSHIFT M21 Rear Derailleur features a durable construction combining high-strength composite and steel components for reliable shifting performance.
- Designed with a super short cage and a maximum cog size of 32 teeth, this derailleur delivers quick, precise gear changes across a wide gear range, enhancing your ride efficiency on various terrains.
- Compatible with Mountain and Road shifters, the M21 rear derailleur offers seamless integration with your existing drivetrain components, ensuring smooth and responsive shifting under load.
- Constructed with a 10x1 standard mounting interface and weighing only 241 grams, this lightweight derailleur is perfect for aggressive trail riding, urban commuting, or all-around cycling adventures.
- Featuring a sleek black finish, the microSHIFT M21 combines performance-driven engineering with stylish aesthetics, making it an excellent upgrade or replacement for your bike's drivetrain.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 12"L x 8"W x 2"H |
| Manufacturer | microSHIFT |
| Global Trade Identification Number | 04710495436388 |
| Item Package Dimensions L x W x H | 6.97 x 5.43 x 2.48 inches |
| Package Weight | 0.3 Kilograms |
| Item Dimensions  LxWxH | 6.5 x 6 x 3 inches |
| Brand Name | microSHIFT |
| Warranty Description | Limited Warranty |
| Model Name | M21 Rear Derailleur |
| Suggested Users | Does Not Apply |
| Number of Items | 1 |
| Part Number | RD-M21SS |
| Style | Rear Derailleur |
| Included Components | Rear Derailleur |
| Size | Super Short Cage |

## Product Details

- **Brand:** microSHIFT
- **Color:** Black
- **Material:** Multi
- **Item Weight:** 10.4 ounces
- **Mounting Type:** Braze-On Mount

## Images

![microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black - Image 1](https://m.media-amazon.com/images/I/51eT-4kA5wL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Hard to believe that such an inexpensive product could be such an improvement
*by B***S on January 26, 2022*

I purchased an old Tern Link seven speed folding bike that was a complete wreck. Among other issues, the Shimano Tourney derailleur was a blob of rust. After I wasted money derusting it, purchasing a new pivot bolt and shims for the pivot bolt, etc., I noticed that there was a lot of friction when trying to pedal. Turns out the derailleur had been bent in an accident and was at an angle to the rear wheel, inducing drag.The bike has only a singe chainring on the crank and the rear is 14-28T (28 minus 14 is only 14 tooth chain wrap capacity), so a short cage for quick shifts is ideal. Also, since the wheels on the bike are only 20" in diameter, it is desirable to have a short cage for as much road clearance as possible. It was a bit difficult finding a short cage derailleur at a decent price, but this one is great. It seems like by the time the Revoshift hits a new number, it has already shifted into that gear.I have many bikes and the Link is the one I want to use when I travel, as it folds, cost the least and looks like a beater so hopefully will be less prone to theft. But now it is the most responsive bike I have. It's really nice not having to wait for it to shift while negotiating traffic like with long cage derailleurs.The deraileur took around ten minutes to install. The cable feed is towards the bottom rear, so it needs more cable sleeve than the Tourney (where the feed was at the top rear). Fortunately, I had left a few extra inches of cable sleeve on the bike. Interestingly, around six inches of the the cable itself needed to be clipped off upon installation. There is very little naked cable after the sleeve enters the housing. So if you find the cable sleeve to be too short, you probably will only need a new sleeve but not a new cable.All in all, I was very happily surprised by the quality of this derailleur and the improvement it made on my bike.

### ⭐⭐⭐⭐⭐ 20-in mountain bike must have!
*by T***! on November 16, 2023*

I received this bike without a rare derailleur as a donation to our ministry.I tried several derailles on it but none was fully functional. I could get them to shift but the bee screw adjustment would not line up and eventually the derailleur would move.upon installing this, I had to break the chain but everything lined up great plus I got an extra maybe 2 in of ground clearance. microshift is really smart to build this derailleur at a great price! other short cage you railers started at $35. no wonder they get cloned. this is my new favorite derailleur! please excuse the photos!

### ⭐⭐⭐⭐⭐ Fast, smooth shifting. Much better than Shimano at this price point.
*by D***S on August 15, 2021*

The derailleur body and internals are made primarily of steel, including where the set screws are used to set top-bottom range. This made the setup easy and gives a sense of durability. At this price point, everything on a Shimano derailleur is plastic. This Microshift setup shifts fast and smooth and I like the compact, short cage design. Initial rides have been really enjoyable. Nice replacement for lower end Shimano derailleur.

## Frequently Bought Together

- microSHIFT M21 Rear Derailleur - 6,7 Speed, Super Short Cage, Black
- Bike Chain Kit, Single/6/7/8/9/10/11/12 Speed Multi-Function Bike Mechanic Repair Kit, Chain Breaker and Bike Link Plier with Hook and 6 Pairs Bicycle Buckle, Reusable (6/7/8 Speed Bike Chain Kit)
- Thinvik 6/7/8 Bike Speed Freewheel 14-28T/14-34T/13-34T,Bicycle Freewheel,Multiple Freewheel,Bike Sprocket

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**Shop now:** [https://www.desertcart.com.pa/products/204469439-microshift-m21-rear-derailleur-6-7-speed-super-short-cage](https://www.desertcart.com.pa/products/204469439-microshift-m21-rear-derailleur-6-7-speed-super-short-cage)

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-01-28*