---
product_id: 640988519
title: "Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mo..."
brand: "relwears"
price: "€ 35.59"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.hr/products/640988519-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger
store_origin: HR
region: Croatia
---

# Durable aluminum alloy build 6/7 speed compatibility Direct mount for secure fit Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mo...

**Brand:** relwears
**Price:** € 35.59
**Availability:** ✅ In Stock

## Summary

> ⚡ Shift into the future with precision and power!

## Quick Answers

- **What is this?** Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mo... by relwears
- **How much does it cost?** € 35.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/640988519-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger)

## Best For

- relwears enthusiasts

## Why This Product

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

## Key Features

- • **Direct Mount Design:** Ensures a rock-solid fit and quick installation—no hanger needed.
- • **Lightweight & Compact:** Weighing just 0.34 kg, it adds performance without the bulk.
- • **Versatile Compatibility:** Perfect for MTB, cruiser, folding, and commuter bikes—upgrade your ride instantly.
- • **Seamless 6/7 Speed Shifting:** Effortlessly glide through gears for smooth rides every time.
- • **Robust Aluminum Alloy Construction:** Engineered for durability to withstand rugged mountain and commuter trails.

## Overview

The RD-TY21B is a high-performance rear derailleur designed for 6/7 speed bikes, crafted from durable aluminum alloy with a direct mount system. Compatible with a wide range of bicycles including mountain, commuter, cruiser, and folding bikes, it delivers reliable, smooth gear changes and a secure fit for enhanced riding stability.

## Description

RD-TY21B 6/7 Speed Derailleur - Direct/Hanger Mount for Mountain, Tricycle, Commuter, Cruiser Bikes

## Features

- MODEL: RD-TY21B; Bike rear derailleur is compatible with 6/7 speed most kinds of bikes.
- PERFORMANCE: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- WIDE APPLICATION: This bicycle transmission is Suitable for MTB, mountain bikes, commuter bike, cruiser bike, folding bike etc.
- NOTE: The bike rear derailleur is Direct mount, not Hanger 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 |
|---------------|-------|
| Manufacturer | Relwears |
| Item Package Dimensions L x W x H | 5.47 x 5.39 x 2.76 inches |
| Package Weight | 0.34 Kilograms |
| Brand Name | Relwears |
| Warranty Description | 1 |
| Model Name | TY21B Rear Derailleur |
| Included Components | NO |
| Size | 6/7 Speed |

## Product Details

- **Brand:** Relwears
- **Color:** Silver-RD-TY21B-Direct Mount
- **Material:** Aluminum
- **Item Weight:** 0.34 Kilograms
- **Mounting Type:** Direct Mount

## Images

![Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mo... - Image 1](https://m.media-amazon.com/images/I/61qvSb1pU8L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ E bike parts
*by J***A on September 18, 2025*

I received it on time and it was just what I needed to fix my grandsons e-bike

### ⭐⭐⭐⭐⭐ Buy it!
*by J***A on September 10, 2025*

I got an estimate of $100 to fix this part at a bike shop. I bought this and replaced it in less than an hour. I’m so happy!!!

### ⭐⭐⭐⭐ Works ok.
*by D***K on July 28, 2025*

Works ok. I've seen better and seen worse.

## Frequently Bought Together

- Bike Rear Derailleur RD-TY21B 6/7 Speed Direct Mount/Hanger Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike
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- Single/6/7/8/9/10/11/12 Speed Bike Chain, Bike Chain for Road Mountain Racing Cycling(6/7/8 Speed Chan, 1 Set)

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**Shop now:** [https://www.desertcart.hr/products/640988519-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger](https://www.desertcart.hr/products/640988519-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-06-07*