How to Install Your XX1 Eagle AXS (12-speed) Rear Derailleur at Home

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Installing the XX1 Eagle AXS 12-speed rear derailleur can seem like a daunting task, but with the right tools and a step-by-step approach, you can successfully complete the installation and ensure your bike’s drivetrain is performing at its best. This guide provides detailed instructions for a smooth installation process, from the tools required to troubleshooting common issues.

Tools Required

Before starting the installation, make sure you have the following tools on hand:

  • 5mm and 3mm Allen wrenches [paid link]
  • T25 Torx wrench
  • Chain whip tool
  • Cassette lockring tool
  • Torque wrench
  • Phillips screwdriver
  • Bicycle grease or anti-seize compound
  • SRAM AXS battery
  • SRAM Eagle chain (12-speed)
  • Cable cutters (if applicable)

Installation of the XX1 Eagle AXS (12-speed) Rear Derailleur

Step 1: Prepare the Bike

  • Place your bike in a repair stand to keep it stable and at a comfortable working height.
  • Shift the chain into the smallest cog to relieve tension on the derailleur.
  • Remove the rear wheel to allow easier access to the derailleur hanger.

Step 2: Install the Derailleur Hanger

If you’re installing a new derailleur hanger, ensure it’s properly aligned with the frame. Use a derailleur hanger alignment tool to check for any bending or misalignment. A straight hanger ensures smooth shifting performance.

Step 3: Mount the Derailleur

  • Attach the XX1 Eagle AXS rear derailleur to the derailleur hanger using the provided mounting bolt.
  • Tighten the bolt using a 5mm Allen wrench. Be careful not to overtighten as this could damage the hanger or derailleur.
  • Apply a small amount of grease to the mounting bolt to prevent seizing.

Step 4: Install the AXS Battery

  • Locate the battery compartment on the derailleur. Insert the SRAM AXS battery by sliding it into place until it clicks securely.
  • Ensure the battery is oriented correctly, with the contact points aligned for proper electrical connection.

Step 5: Attach the Chain

  • Install the 12-speed SRAM Eagle chain, ensuring it runs smoothly over the jockey wheels of the derailleur.
  • Use a chain tool to size the chain appropriately. Make sure the chain is properly threaded through the derailleur and on the cassette.
  • Attach the chain to the front chainring and cassette, ensuring it is properly routed through the derailleur.

Step 6: Install the Cassette

If you are installing a new cassette, place it onto the freehub body and tighten the lockring using a cassette lockring tool and a torque wrench to the recommended specification (usually around 40-50 Nm).

Step 7: Set Up the AXS Shifting System

  • Install the AXS controller (usually on the handlebars) by mounting it securely with the provided screws.
  • Pair the AXS controller with the derailleur by following the pairing instructions in the SRAM AXS app. This step ensures the wireless communication between the derailleur and controller is properly established.

Step 8: Adjust the Derailleur

  • Use the derailleur’s limit screws (marked as ‘L’ for low and ‘H’ for high) to set the range of movement for the derailleur. The limit screws ensure the derailleur does not shift beyond the smallest or largest cog.
  • Adjust the B-screw to maintain the appropriate distance between the derailleur and the cassette.

Step 9: Fine-Tune the Shifting

  • Shift through all the gears and observe the derailleur’s performance. If necessary, adjust the indexing by fine-tuning the barrel adjuster located on the derailleur or shifter.
  • Test shifting by running through all gears to ensure smooth, accurate shifts.

Step 10: Reinstall the Rear Wheel

  • After confirming the derailleur is properly installed and adjusted, reinstall the rear wheel onto the bike. Ensure it is securely fastened.

Step 11: Test the System

Once the derailleur and components are in place, test the entire shifting system. Shift through the gears both on the stand and while riding to check for smooth operation and proper tension.

Troubleshooting Common Set-Up Issues

Derailleur Not Shifting Smoothly

  • Check for Cable Tension: Ensure there is enough tension in the derailleur cable. You can adjust this using the barrel adjuster.
  • Verify the B-Screw Adjustment: If the derailleur is too far from the cassette, adjust the B-screw to bring it closer for smoother shifting.

Battery Not Pairing with AXS Controller

  • Check Battery Charge: Ensure the AXS battery is fully charged and properly seated.
  • Re-pair the Devices: Sometimes the system requires a reset. Follow the instructions in the SRAM AXS app to un-pair and re-pair the devices.

Chain Dropping Off Cassette

  • Check Limit Screws: The limit screws may need adjustment if the derailleur is shifting too far off the cassette.
  • Inspect the Chainline: Ensure the chain is correctly aligned with the cassette and chainring. A misaligned chainline could cause issues with the shifting.

Customization and Optimization for Better Performance

Adjusting the Derailleur Hanger

For the best shifting performance, it’s important to adjust the derailleur hanger regularly to avoid poor alignment that can cause skipping or poor shifts. Using a derailleur hanger alignment tool is recommended to keep everything running smoothly.

Fine-Tuning Shifting with AXS App

The SRAM AXS app allows you to fine-tune your shifting preferences by adjusting the derailleur’s behavior, such as shift speed and shift timing. This feature allows you to customize the performance to your riding style, giving you better control and efficiency on the trails.

Comparison with Similar Models

When compared to the XX1 Eagle mechanical derailleur, the AXS model stands out due to its wireless technology, which eliminates the need for cables and housing. This offers a cleaner setup with less friction, resulting in smoother and more reliable shifts. Additionally, the wireless design allows for easy maintenance and installation since you don’t need to deal with the complexities of routing cables through the frame.

The XX1 Eagle AXS also provides a more precise shifting experience, especially in harsh conditions, compared to its mechanical counterpart. For riders who want top-tier performance with the convenience of wireless technology, the XX1 Eagle AXS is a standout choice.

Compatibility with Other Drivetrain Components

The XX1 Eagle AXS rear derailleur is designed to work seamlessly with other SRAM Eagle components. It is compatible with SRAM’s 12-speed cassettes, such as the XD driver body, and the SRAM Eagle chain. When pairing with other brands, ensure compatibility with a 12-speed drivetrain to achieve the best performance. The system’s AXS technology is designed to work with any AXS-compatible components, allowing for easy upgrades or additions in the future.