Your drivetrain is only as strong as its most precise connection, and that's where the derailleur hanger comes in. Also known as a dropout, this small but vital frame part links your rear derailleur to the bike frame and plays a key role in shifting accuracy, drivetrain alignment, and crash protection.

At BikesOnline, we stock a wide range of bicycle hangers for road, gravel, mountain, and e-bikes. Whether you’re replacing a bent hanger or building a frame from the ground up, our high-quality derailleur hangers ensure your shifting remains smooth and your ride stays on track.

What Is a Derailleur Hanger?

A derailleur hanger is a replaceable component that connects the rear derailleur to your bike’s frame. It’s designed to absorb impact in the event of a crash or derailleur strike—protecting the more expensive frame parts and drivetrain components from damage.

If your shifting feels off, the hanger may be misaligned or bent. Replacing it with a precision-fit model restores shifting performance and helps avoid long-term drivetrain wear.

When to Replace Your Hanger

• You’ve crashed or dropped the bike and shifting feels off
• The derailleur cage looks tilted or misaligned
• You hear chain skipping or rubbing, especially in specific gears
• You’re installing a new drivetrain or rear derailleur and want perfect alignment

Hanger alignment is critical for smooth gear changes—especially on modern bikes with tight cassette spacing and electronic or high-tension shifting systems.

Compatible with a Wide Range of Bikes

Our derailleur hangers are compatible with:

• Mountain bikes, including full-suspension and hardtails
• Road and gravel bikes, including carbon and alloy frames
• E-bikes, where stronger torque and weight make hanger alignment even more important
• Bikes using common drivetrain brands like Shimano, SRAM, and Campagnolo

If you’re unsure which hanger fits your frame, our team can help you identify the right model based on your bike brand and year.

Pair with Quality Components

Replacing your hanger is often done during other key maintenance tasks for the drivetrain. Consider checking your:

• Derailleur for wear or crash damage
• Brake parts like calipers & levers or pads if the impact was near the rear triangle
• Cockpit alignment (bars, grips, and seatpost) to ensure full control
• Wheels, especially if the impact affected the rear axle or dropout spacing
• Multi-tools – a hanger alignment gauge or derailleur bolt tool makes installation easier

For performance-focused riders, combining a straight hanger with a fresh chain and cassette improves shifting efficiency and drivetrain life.

Shop Derailleur Hangers at BikesOnline Australia

Bikes Online Australia offers derailleur hangers built to factory specs—ensuring reliable fit and perfect alignment. Keep one as a backup, especially if you’re heading out on a tour or long-distance trip where hanger damage could leave you stranded.

With fast delivery and a wide selection of popular brands, we make it easy to get the exact replacement part you need to keep your ride dialled in.