---
product_id: 631062118
title: "Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike"
brand: "relwears"
price: "€ 40.16"
currency: EUR
in_stock: true
reviews_count: 9
category: "Relwears"
url: https://www.desertcart.sk/products/631062118-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger
store_origin: SK
region: Slovakia
---

# Durable aluminum alloy build 6/7 speed compatibility Fits MTB, commuter & cruiser bikes Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike

**Brand:** relwears
**Price:** € 40.16
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift into the future of smooth rides — don’t get left behind!

## Quick Answers

- **What is this?** Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike by relwears
- **How much does it cost?** € 40.16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/631062118-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

- • **Trusted by Riders:** Highly rated with 4.3 stars and proven to outperform original parts
- • **Effortless Installation:** Direct fit replacement that upgrades your bike’s drivetrain instantly
- • **Seamless 6/7 Speed Shifting:** Optimized for smooth gear transitions on diverse bike types
- • **Universal Hanger Mount Design:** Compatible with most mountain, commuter, cruiser, and folding bikes
- • **Robust Aluminum Alloy Construction:** Engineered for long-lasting durability and reliable performance

## Overview

The Rear Derailleur RD-TY21B is a high-performance, hanger mount derailleur compatible with 6 and 7-speed bikes. Crafted from durable aluminum alloy, it ensures stable and precise shifting across mountain, commuter, cruiser, and folding bikes. Designed for easy installation and trusted by riders for its reliability, this derailleur upgrades your bike’s drivetrain for a safer, smoother ride.

## Description

desertcart.com : Rear Derailleur RD-TY21B 6/7 Speed Hanger Mount for Mountain, Tricycle, Commuter, and Cruiser Bike : Sports & Outdoors

Review: exact fit for the bike - Was a direct fit for my grandsons bike which he and his sister have been riding since he installed it with no problems. works better then the one that came on the bike
Review: Good product - Good product but on work on old stily frames like side doesn't not fit on new model mountain bikes when the braket its down it only mount on the side

## 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 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 |
|---------------|-------|
| ASIN | B0CXPJDS3B |
| Best Sellers Rank | #110,560 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #52 in Rear Bike Derailleurs |
| Brand Name | Relwears |
| Customer Reviews | 4.3 4.3 out of 5 stars (43) |
| Date First Available | March 11, 2024 |
| Included Components | NO |
| Item Package Dimensions L x W x H | 5.59 x 5.59 x 2.44 inches |
| Manufacturer | Relwears |
| Model Name | TY21B Rear Derailleur |
| Package Weight | 0.33 Kilograms |
| Size | 6/7 Speed |
| Warranty Description | 1 |

## Product Details

- **Brand:** Relwears
- **Color:** Black-RD-TY21B-Hanger Mount
- **Item Weight:** 0.32 Kilograms
- **Material:** Aluminum
- **Mounting Type:** Hanger Mount

## Images

![Bike Rear Derailleur RD-TY21B 6/7 Speed Direct/Hanger Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike - Image 1](https://m.media-amazon.com/images/I/71p1qzCpc5L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ exact fit for the bike
*by E***N on December 9, 2025*

Was a direct fit for my grandsons bike which he and his sister have been riding since he installed it with no problems. works better then the one that came on the bike

### ⭐⭐⭐⭐⭐ Good product
*by A***S on October 27, 2025*

Good product but on work on old stily frames like side doesn't not fit on new model mountain bikes when the braket its down it only mount on the side

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

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

## Frequently Bought Together

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

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**Shop now:** [https://www.desertcart.sk/products/631062118-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger](https://www.desertcart.sk/products/631062118-bike-rear-derailleur-rd-ty21b-6-7-speed-direct-hanger)

---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-21*