Aluminum Alloy Bicycle Derailleur Hanger - Pack of 2

Key Features

• Sacrificial Design: Engineered to bend or break before your expensive bike frame or rear derailleur is damaged during an impact, acting as a "mechanical fuse" for your drivetrain.
• Precision CNC Machining: Manufactured from 6061 aluminum alloy to provide the perfect balance of rigidity for crisp shifting and malleability for frame protection.
• Universal Compatibility: Designed to fit a wide variety of frames across mountain, road, and cyclocross disciplines; available in multiple geometric patterns to match specific dropout shapes.
• Anodized Finish: Features a corrosion-resistant coating that prevents oxidation and seizing, ensuring the mounting bolts remain removable even after exposure to mud and road salt.
• Complete with Mounting Hardware: Each hanger in the 2-pack typically includes the necessary set screws or bolts for a secure, flush-mount installation to the frame dropout.

Replaces / Cross-Reference Part Numbers

• Bicycle Tail Hook / Frame Gear Tail Hook
• Rear Mech Hanger Replacement
• Dropout Adapter Bracket
• (Note: Specific part numbers vary by bike brand, e.g., Wheels Mfg #27, Canyon No. 25, etc.)

Compatibility & Fitment

Derailleur hangers are highly specific to the shape of the bike frame's dropout. Key considerations include:

• Bicycle Types: Mountain Bikes (MTB), Road Racing, Cyclocross, and Gravel bikes.
• Frame Material: Primarily used on Aluminum, Carbon Fiber, and select Titanium frames.
• Mounting Styles: Available in 1-bolt, 2-bolt, or 3-bolt configurations depending on the specific "Tail Hook" geometry of your bike model.
• Identification: To ensure fitment, visually compare your old hanger to the product image; even slight differences in the "shoulder" or bolt placement will prevent installation.

When to Replace

• Visible Bend: The rear derailleur looks tilted toward the spokes when viewed from behind. Note: Attempting to bend an aluminum hanger back more than once usually results in a snap.
• Ghost Shifting: The chain jumps between gears or refuses to stay in the smallest or largest cogs despite proper cable tension and derailleur adjustment.
• Impact/Crash: If the bike has fallen on the drive-side (the side with the chain), the hanger is likely compromised.
• Snapped Hanger: The hanger has completely broken off, leaving the derailleur hanging by the cable.
• Stripped Threads: The internal threads where the derailleur bolts on are cross-threaded or flattened, preventing a secure connection.

Installation Tips

• Carry a Spare: This is a 2-pack for a reason. Always keep the second hanger in your saddlebag or hydration pack; a broken hanger is a "ride-ending" mechanical that can only be temporarily fixed by converting the bike to a singlespeed.
• Clean the Dropout: Before installing the new hanger, use a rag and a bit of degreaser to clean the mounting surface on the frame. Any grit trapped behind the hanger will cause shifting issues.
• Grease the Bolts: Apply a tiny drop of blue thread-locker (Loctite 242) or grease to the mounting screws to prevent them from vibrating loose during rough rides.
• Check the Derailleur: If your hanger broke, your derailleur might also be bent. Inspect the derailleur cage to ensure it is parallel to the wheel after the new hanger is installed.
• Hanger Alignment Tool: For the most precise shifting, use a Hanger Alignment Gauge (DAG) after installation. Even brand-new hangers can be slightly out of alignment due to minor frame variances.