---
product_id: 519206712
title: "Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike"
brand: "rainflowwer"
price: "€ 39.97"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/519206712-black-sliver-rear-derailleur-rd-ty21b-6-7-speed-direct
store_origin: FI
region: Finland
---

# Direct mount design 6/7 speed compatibility Durable aluminum alloy Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike

**Brand:** rainflowwer
**Price:** € 39.97
**Availability:** ✅ In Stock

## Summary

> ⚡ Shift into the fast lane with precision and durability!

## Quick Answers

- **What is this?** Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike by rainflowwer
- **How much does it cost?** € 39.97 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/519206712-black-sliver-rear-derailleur-rd-ty21b-6-7-speed-direct)

## Best For

- rainflowwer enthusiasts

## Why This Product

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

## Key Features

- • **Robust Direct Mount:** Engineered for a secure fit, ensuring stability and performance on every trail.
- • **Pro-Level Reliability:** Backed by expert support and crafted for consistent, safe cycling adventures.
- • **Lightweight Aluminum Alloy:** Built tough yet light, resisting deformation for long-lasting durability.
- • **Precision 6/7 Speed Shifting:** Seamlessly switch gears with SIS index compatibility for smooth rides every time.
- • **Versatile Bike Compatibility:** Perfect for mountain, road, commuter, folding, and kids' bikes—your all-in-one drivetrain upgrade.

## Overview

The RainFlowwer RD-TY21B rear derailleur is a direct mount, 6/7 speed compatible bicycle component made from durable aluminum alloy. Designed for a wide range of bikes including mountain, road, and commuter models, it offers reliable, smooth gear shifting and a secure fit to enhance your cycling performance.

## Description

Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike

## Features

- MODEL: Bicycle rear derailleur RD-TY21B, suitable for 6 and 7 speed SIS index variable speed drives
- Note: The bike rear derailleur is direct mount , not hanger direct mount. Please check the mount way before you purchase.
- MATERIAL: Made of durable aluminum alloy material, which ensures your safe and stable on the ride, not easily deformed and pretty solid.
- WIDE APPLICATION: This bicycle transmission is suitable for variable speed bikes, mountain bikes, road bikes, bicycle racing, city bikes, folding bikes, etc.It is your indispensable bicycle accessories during your cycling journey.
- Important: If you have any questions, please feel free to contact us, we will provide you with professional services.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Mounting Type | Direct Mount |
| Number of Teeth | 21 |
| Manufacturer | RainFlowwer |
| Item Package Dimensions L x W x H | 6.14 x 4.65 x 2.56 inches |
| Package Weight | 0.27 Kilograms |
| Brand Name | RainFlowwer |
| Warranty Description | 1 month |
| Model Name | rear-bike-derailleurs |
| Suggested Users | unisex-adult |
| Part Number | 2 |
| Included Components | rear derailleurs |
| Size | One Size |

## Product Details

- **Brand:** RainFlowwer
- **Color:** RD-TY21B/Direct Mount-Black
- **Material:** Aluminum
- **Item Weight:** 0.27 Kilograms
- **Case Material:** Aluminum

## Images

![Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike - Image 1](https://m.media-amazon.com/images/I/61H-U0u9QIL.jpg)
![Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike - Image 2](https://m.media-amazon.com/images/I/719S6Qud25L.jpg)
![Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike - Image 3](https://m.media-amazon.com/images/I/71NWUTL09yL.jpg)
![Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike - Image 4](https://m.media-amazon.com/images/I/61I3+Zg0ZWL.jpg)
![Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike - Image 5](https://m.media-amazon.com/images/I/61KaPngGe8L.jpg)

## Available Options

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

## Frequently Bought Together

- Black/Sliver Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount for Mountain Bike Kids Commuter Bike
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**Shop now:** [https://www.desertcart.fi/products/519206712-black-sliver-rear-derailleur-rd-ty21b-6-7-speed-direct](https://www.desertcart.fi/products/519206712-black-sliver-rear-derailleur-rd-ty21b-6-7-speed-direct)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-15*