How to Properly Install a Derailleur Hanger

A derailleur hanger might be one of the smallest parts on your bike, but it plays a big role in keeping your gears running smoothly. It acts as a critical link between your frame and rear derailleur, and is designed to take the hit in a crash, by bending or breaking to protect more expensive components. Whether you're upgrading, replacing a damaged hanger, or fine-tuning your drivetrain, proper installation is key to performance and longevity. Here's how to do it right.

Step 1: Identify the Correct Hanger
Derailleur hangers are not universal. Each frame often requires a specific design, so be sure to choose a hanger that matches your bike’s make and model. At BETD, we offer a wide range of precision-engineered hangers compatible with most major bike brands. If you’re unsure which hangers is right for your bike, speak to our expert team who will be happy to help.

Step 2: Remove the Rear Wheel & Derailleur
Before installation, shift the chain onto the smallest rear cog, then remove the rear wheel. Unscrew and remove the existing derailleur from the hanger using a 5mm Allen key. Keep the derailleur safe; there’s no need to disconnect the chain.

Step 3: Remove the Old Hanger
Using the correct tool or Allen key, unscrew the old derailleur hanger from the dropout. Clean the area thoroughly, removing any dirt, debris, or old thread-locking compound.

Step 4: Install the New Hanger
Align the new derailleur hanger precisely with the dropout. Secure it using the appropriate screws or bolts, tightening them evenly and to the manufacturer’s torque specifications. A misaligned hanger can lead to poor shifting or even damage your derailleur.

Step 5: Reattach Derailleur and Wheel
Reinstall the rear derailleur onto the new hanger and reattach the rear wheel. Shift through all gears to ensure smooth and accurate transitions. Use a derailleur hanger alignment tool if needed for fine adjustments.

Derailleur Hangers from BETD

Installing a derailleur hanger correctly is vital for performance and safety. Here at BETD, we manufacture high-quality, CNC-machined derailleur hangers designed for strength, alignment, and perfect fit. With over 400 hangers in stock, plus screws, bolts, and other essential replacement components, we’re here to help you ride with confidence, no matter the trail or terrain.

Get in touch with our cycling experts or shop online today to find the components for your bike.