---
product_id: 625058465
title: "RD-TY21B 6/7 Speed Direct Mount Derailleur for Mountain Tricycle Commuter Cruiser Bike"
brand: "relwears"
price: "S/.133"
currency: PEN
in_stock: true
reviews_count: 9
category: "Relwears"
url: https://www.desertcart.pe/products/625058465-rd-ty21b-6-7-speed-direct-mount-derailleur-for-mountain
store_origin: PE
region: Peru
---

# Durable aluminum alloy build 6/7 speed compatibility Direct mount for versatile bike types RD-TY21B 6/7 Speed Direct Mount Derailleur for Mountain Tricycle Commuter Cruiser Bike

**Brand:** relwears
**Price:** S/.133
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** RD-TY21B 6/7 Speed Direct Mount Derailleur for Mountain Tricycle Commuter Cruiser Bike by relwears
- **How much does it cost?** S/.133 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/625058465-rd-ty21b-6-7-speed-direct-mount-derailleur-for-mountain)

## 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

- • **Quick & Easy Installation:** Swap out your old derailleur hassle-free and get back on the road fast.
- • **Seamless 6/7 Speed Shifting:** Effortlessly glide through gears with precision and speed.
- • **Smooth & Stable Performance:** Experience reliable shifting that keeps you in control on every terrain.
- • **Universal Direct Mount Design:** Fits mountain, commuter, cruiser, folding, and tricycle bikes with ease.
- • **Rugged Aluminum Alloy Construction:** Engineered for durability to withstand your toughest rides.

## Overview

The RD-TY21B is a high-performance 6/7 speed rear derailleur crafted from durable aluminum alloy. Designed for direct mount installation, it offers smooth, reliable shifting across a wide range of bike types including mountain, commuter, cruiser, folding, and tricycle bikes. Backed by a 1-year warranty and praised for easy installation and stable performance, it’s the perfect upgrade for riders seeking dependable drivetrain precision.

## Description

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

Review: Item as described - I had no trouble at all with installing it . Works great... smooth shifting.
Review: Great price and quality - Needed a quick replacement for a customer. Nice quality and good fit and easy adjustment. Only been on for a month, so I cant speak of durability as of yet.

## 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 |
|---------------|-------|
| ASIN | B0CWNNL8WH |
| Best Sellers Rank | #26,899 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Rear Bike Derailleurs |
| Brand Name | Relwears |
| Customer Reviews | 4.4 4.4 out of 5 stars (160) |
| Date First Available | February 28, 2024 |
| Included Components | NO |
| Item Package Dimensions L x W x H | 4.8 x 4.72 x 2.44 inches |
| Manufacturer | Relwears |
| Model Name | TY21B Rear Derailleur |
| Package Weight | 0.32 Kilograms |
| Part Number | RD-TY21B 6/7 Speed |
| Size | 6/7 Speed |
| Warranty Description | 1 |

## Product Details

- **Brand:** Relwears
- **Color:** Black-RD-TY21B-Direct Mount
- **Item Weight:** 0.33 Kilograms
- **Material:** Aluminum
- **Mounting Type:** Direct Mount

## Images

![RD-TY21B 6/7 Speed Direct Mount Derailleur for Mountain Tricycle Commuter Cruiser Bike - Image 1](https://m.media-amazon.com/images/I/71DG7SKHTeL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Item as described
*by M***E on February 6, 2026*

I had no trouble at all with installing it . Works great... smooth shifting.

### ⭐⭐⭐⭐⭐ Great price and quality
*by A***R on October 12, 2025*

Needed a quick replacement for a customer. Nice quality and good fit and easy adjustment. Only been on for a month, so I cant speak of durability as of yet.

### ⭐⭐⭐⭐ Nice
*by R***S on September 24, 2025*

It seems to work well

## 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.pe/products/625058465-rd-ty21b-6-7-speed-direct-mount-derailleur-for-mountain](https://www.desertcart.pe/products/625058465-rd-ty21b-6-7-speed-direct-mount-derailleur-for-mountain)

---

*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-03-17*