RISK Parts 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

 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. 11.5 g
• Easy upgrade part for improved climbing gear range
• Includes matching bolt for installation
• Professional RISK branded packaging