Home > All Products > Brand > RISK > RISK Mountain/Road Bike Frame Tail Hook Extender Freewheel Rear Derailleur Hanger Extension Converter 40T 42T 46T RA105

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RISK Mountain/Road Bike Frame Tail Hook Extender Freewheel Rear Derailleur Hanger Extension Converter 40T 42T 46T RA105

Name: RISK Mountain/Road Bike Frame Tail Hook Extender Freewheel Rear Derailleur Hanger Extension Converter 40T 42T 46T RA105
Brand: DJC Bikes - DJC Components
Price: 11.52 USD
Availability: InStock

$11.52 ~~$16.00~~

-28%

RISK Mountain/Road Bike Frame Tail Hook Extender Freewheel Rear Derailleur Hanger Extension Converter 40T 42T 46T RA105.

Compatibility: MTB and road bike cassette upgrade setups.

MTB Cassette Compatibility: 40T / 42T / 46T / 50T / 52T.

Options: Black; Red.

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Specifications
Warranty FAQ

RISK Mountain/Road Bike Frame Tail Hook Extender Freewheel Rear Derailleur Hanger Extension Converter 40T 42T 46T RA105

The RISK RA105 Rear Derailleur Hanger Extender is designed for riders who want to upgrade their bike drivetrain to a wider-range cassette. By extending the rear derailleur mounting position, it helps improve compatibility with larger sprockets and provides extra clearance for cassette upgrade setups.

This derailleur hanger extender is suitable for both mountain bikes and road bikes, supporting common wide-range cassette upgrade solutions such as MTB 40T, 42T, 46T, 50T, 52T and road bike 34T, 36T, 40T, 42T cassette setups.

Made from lightweight aluminum alloy, the RA105 features a hollowed-out design to reduce weight while maintaining strength. The anodized surface finish improves corrosion resistance and adds a clean, premium look to your bike. The contact surface adopts a radial anti-loosening groove design for a more secure fit.

Each set includes the derailleur hanger extender and matching fixing bolt, packaged in RISK branded packaging.

Key Features

Designed for rear derailleur hanger extension
Helps upgrade to wide-range cassette setups
Compatible with MTB 40T / 42T / 46T / 50T / 52T cassette upgrades
Compatible with road bike 34T / 36T / 40T / 42T cassette upgrades
Lightweight aluminum alloy construction
Hollow design for reduced weight
Anodized surface for corrosion resistance and durable color
Radial anti-loosening groove design for secure installation
Adjustable installation angle for flexible tuning
Suitable for mountain bikes, road bikes, gravel bikes, and commuter bikes
Includes fixing bolt
Recommended torque: 15–20 N·m

Product Specifications

Item	Details
Brand	RISK
Model	RA105
Product Name	Rear Derailleur Hanger Extender
Material	Aluminum Alloy
Use	Extending rear derailleur hanger position
Compatibility	MTB and road bike cassette upgrade setups
MTB Cassette Compatibility	40T / 42T / 46T / 50T / 52T
Road Cassette Compatibility	34T / 36T / 40T / 42T
Center Distance	Approx. 28.9mm
Length	Approx. 50.8mm
Bolt Thread	M10
Product Size	Approx. 5.1 × 1.5 × 1 cm
Weight	Approx. 11.5g
Package	1 set / RISK branded bag or card packaging
Package Size	Approx. 10 × 8 × 1 cm
Recommended Torque	15–20 N·m
Color Options	Black, Red
Key Feature	Designed for rear derailleur hanger extension Helps upgrade to wide-range cassette setups

Package Includes

Each set includes:

1 × RISK RA105 rear derailleur hanger extender
1 × Fixing bolt

Important Notes

After installing the derailleur hanger extender, the rear derailleur must be readjusted.
Proper adjustment requires experience and tuning skills.
Beginners are recommended to have it installed by a professional bike shop.
Compatibility may vary depending on frame design, derailleur model, chain length, and cassette size.
Please check your bike setup before purchase.
Manual measurement may have slight deviation.

Why Choose RISK RA105
Enables wider cassette compatibility
Lightweight and durable aluminum alloy body
Suitable for MTB and road bike drivetrain upgrades
Clean anodized finish in black or red
Compact design, approx. 11.5g
Easy upgrade part for improved climbing gear range
Includes matching bolt for installation
Professional RISK branded packaging

RISK Mountain/Road Bike Frame Tail Hook Extender Freewheel Rear Derailleur Hanger Extension Converter 40T 42T 46T RA105

Available Options

Each row below is one available option combination. Choose the complete combination that matches your setup.

Option 1
Black
Red

All Taxes & Duties Included • Fast Delivery (8–12 Days) • No Hidden Fees • 6-Month Warranty

1 How long is the warranty?
We offer 6 months limited warranty to all products because of the quality defects. We offer lifetime payable repair service after the warranty.

2 Do need to pay tax duty when package arrive my country?
You no need to pay tax when package arrive your country, most countries in the world no need pay.
USA aslo no need tax duty and tariff, our carrier will cover it.

Brazil, Chile, Columbia clients need pay import duty when package arrive your country.

3 Can I return the goods if I am not like it?
Yes you can apply return and refund when you receive the product within 7 days. But as return shipping fee is relatively high when send back to China, so we suggest you consider and carefully before purchase.

Or you can send message to us and discuss technical issues to clarify if the products is what you need, and then pay after you sure your order is correct.

4 How long is the shipping time?
To most countries 7-15days can arrive your address. Pay extra 20USD if want ship by Fedex DHL UPS.

5 How can I know the tracking number?
We will send the tracking code to your email automatically after we send the package. check the track update here https://www.17track.net/en

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