---
product_id: 544735646
title: "Bike Rear Derailleur 6/7 Speed RD-TY21B Hanger Mount for Mountain Bicycle"
brand: "rainflowwer"
price: "¥6190"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/544735646-bike-rear-derailleur-6-7-speed-rd-ty21b-hanger-mount
store_origin: JP
region: Japan
---

# Durable aluminum alloy build 6/7 speed compatibility Universal fit for MTB & road bikes Bike Rear Derailleur 6/7 Speed RD-TY21B Hanger Mount for Mountain Bicycle

**Brand:** rainflowwer
**Price:** ¥6190
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Shift into the future with flawless precision!

## Quick Answers

- **What is this?** Bike Rear Derailleur 6/7 Speed RD-TY21B Hanger Mount for Mountain Bicycle by rainflowwer
- **How much does it cost?** ¥6190 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/544735646-bike-rear-derailleur-6-7-speed-rd-ty21b-hanger-mount)

## 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

- • **Versatile Compatibility:** Fits mountain, road, folding, and city bikes effortlessly
- • **Precision 6/7 Speed Shifting:** Seamlessly switch gears for smooth rides every time
- • **Reliable Hanger Mount Design:** Secure fit ensures stable, safe cycling adventures
- • **Easy Installation & Maintenance:** Quick to mount and disassemble, keeping you on the move
- • **Robust Aluminum Alloy Construction:** Engineered for long-lasting durability and peak performance

## Overview

The RainFlowwer RD-TY21B Rear Derailleur is a high-quality aluminum alloy component designed for 6/7 speed mountain and road bikes. Its durable construction and versatile hanger mount compatibility make it an essential upgrade for cyclists seeking smooth, reliable gear changes and enhanced riding performance.

## Description

Bike Rear Derailleur 6/7 Speed RD-TY21B Direct Mount/Hanger Mount for Mountain Bicycle

## Features

- MODEL: Bicycle rear derailleur, Suitable for 6/7speed.
- MATERIAL: This bicycle rear derailleur is made of high-quality steel, durable and long service life.Easy to install and disassemble.
- PERFORMANCE: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- 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.
- NOTE: The bike rear derailleur is hanger mount, not direct mount .Please check the mount type of the original part before purchasing. If you have any questions, please feel free to contact us, we will provide you with professional services.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Color | RDTY21B-Hanger Mount |
| Size | RD-TY21B Hanger Mount |
| Material type | Aluminium |
| Included components | RDTY21B/Hanger Mount |
| Batteries included? | No |
| Brand | RainFlowwer |
| Department | Unisex |
| Manufacturer | RainFlowwer |
| Item model number | RDTY21B-Hanger Mount |
| Package Dimensions | 19 x 8.2 x 4.5 cm; 230 g |
| ASIN | B0C7VH1NSY |

## Product Details

- **Brand:** RainFlowwer
- **Colour:** RDTY21B-Hanger Mount
- **Material:** Aluminium
- **Mounting type:** Braze-On Mount
- **Manufacturer:** RainFlowwer

## Images

![Bike Rear Derailleur 6/7 Speed RD-TY21B Hanger Mount for Mountain Bicycle - Image 1](https://m.media-amazon.com/images/I/61AH8Idmr1L.jpg)

## Available Options

This product comes in different **Size Name, Model** options.

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**Shop now:** [https://www.desertcart.jp/products/544735646-bike-rear-derailleur-6-7-speed-rd-ty21b-hanger-mount](https://www.desertcart.jp/products/544735646-bike-rear-derailleur-6-7-speed-rd-ty21b-hanger-mount)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-02*