How to Install, Adjust, and Maintain the X01 Eagle AXS from SRAM

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The SRAM X01 Eagle AXS [paid link] derailleur is a cutting-edge wireless electronic rear shifting system designed for high-performance mountain and trail biking. While its roots lie in off-road racing, many gravel and endurance riders have adopted it for its reliability, clean aesthetics, and smooth, cable-free operation.

This article provides a detailed and technical guide for installing, adjusting, and maintaining the X01 Eagle AXS [paid link] derailleur. This guide is intended for riders who want precise instructions and long-term reliability from their drivetrain.

Tools Required

  • T25 Torx wrench [paid link]
  • Chain breaker tool
  • SRAM AXS mobile app (for firmware and setup tuning)
  • Torque wrench [paid link] with T25 bit
  • Eagle-compatible chain
  • Eagle 12-speed cassette
  • Battery charger and spare AXS battery
  • Rear derailleur hanger alignment gauge

Understanding the SRAM X01 Eagle AXS System

The X01 Eagle AXS [paid link] is a wireless rear derailleur that eliminates the need for mechanical cables. It relies on a battery-powered motor to move the derailleur, controlled via a Bluetooth-connected controller on the handlebar. The system is compatible with all SRAM Eagle 12-speed chains and cassettes, but works optimally with X01, GX, and XX1 AXS components.

The X01 AXS offers:

  • A single-click shifting logic
  • Overload clutch protection
  • Tool-free cage rotation for wheel removal
  • Cross-compatibility with SRAM’s Eagle 12-speed ecosystem

Installing the SRAM X01 Eagle AXS Rear Derailleur

Installing the X01 Eagle AXS derailleur is a precise process, requiring careful attention to alignment and setup to ensure optimal performance.

Rear Derailleur Mounting

Begin by aligning the derailleur hanger using a hanger alignment gauge. The derailleur’s performance is highly sensitive to misalignment.

  • Install the derailleur using a T25 Torx wrench [paid link].
  • Torque the derailleur fixing bolt to 35-40 Nm.
  • Confirm that the B-knuckle pivot sits flush with the hanger.

Battery Installation

  • Slide the battery into the rear derailleur body until it clicks.
  • Confirm engagement by checking the LED light after a brief press on the AXS button.

Chain Installation and Length

  • Use a new 12-speed Eagle chain.
  • Wrap the chain around the largest cog and chainring, bypassing the derailleur.
  • Add two full links to the chain length.
  • Connect the chain with a PowerLock link and verify smooth articulation.

Pairing the System

  • Press and hold the AXS pairing button on the derailleur until the LED flashes.
  • Do the same on the AXS controller (usually on the right shifter).
  • LEDs will blink rapidly and then stabilize, confirming a successful pairing.

Adjusting the X01 Eagle AXS for Optimal Shifting

Fine-tuning the derailleur ensures precise gear changes and longevity.

Setting B-Gap Distance

The B-gap tool provided by SRAM is crucial:

  • Shift to the largest rear cog.
  • Use the tool to measure and adjust the gap between the upper pulley and cog.
  • Rotate the B-tension screw clockwise or counterclockwise as needed.

Limit Screw Adjustment

Even though it’s an electronic system, physical limits prevent over-shifting.

  • Use a T25 wrench to set the high- and low-limit screws.
  • Shift to smallest and largest cogs and ensure the pulley aligns with the cog.
  • Adjust limit screws to prevent derailleur overextension.

Micro-Adjust Using AXS App

  • Open the SRAM AXS app and connect to the derailleur.
  • Use the app’s micro-adjust feature to fine-tune indexing.
  • Make minor changes and test shift performance after each.

Routine Maintenance and Battery Management

The SRAM X01 Eagle AXS requires minimal mechanical maintenance, but regular checks improve its lifespan.

Cleaning

  • Use a soft brush to clean debris from the derailleur after rides.
  • Avoid pressure washing, especially near the battery interface.

Lubrication

  • The derailleur pulleys and pivot points are factory-lubricated.
  • Every 30-40 riding hours, apply light lubricant to the pivots.

Battery Charging

  • Remove the battery and charge using the SRAM USB charger.
  • Charge time is approximately one hour.
  • Carry a spare battery for long-distance or remote rides.

Software Updates and Diagnostics

The AXS ecosystem is app-integrated for diagnostics and firmware updates.

  • Connect your derailleur to the SRAM AXS mobile app.
  • Check for firmware updates monthly or after prolonged storage.
  • View shift count and system diagnostics via the app.

Common Set-Up Errors and Corrections

Mistakes during installation can lead to subpar performance.

  • Incorrect chain length: Can cause poor shifting and chain retention issues. Always size using SRAM’s method.
  • Misaligned derailleur hanger: Leads to inconsistent shifting. Always check hanger alignment before installation.
  • B-gap too wide or too tight: Affects large cog shifting. Always use the SRAM B-gap tool for precise adjustment.
  • Forgotten limit screw adjustment: Risks overshooting cogs and causing drivetrain damage.

Compatibility Insights for X01 Eagle AXS

The X01 Eagle AXS is compatible with all SRAM Eagle cassettes and chains. However, some details matter:

  • Compatible Cassettes: Works best with XG-1295 [paid link] or XG-1275 [paid link] (10-50T or 10-52T).
  • Controllers: Must use AXS wireless controllers, either Eagle AXS or AXS Reverb [paid link] (for dropper setup).
  • Cranksets: Compatible with SRAM DUB [paid link] or GXP [paid link] cranksets designed for 12-speed Eagle drivetrains.

Avoid mixing mechanical Eagle components with AXS without proper conversion kits.

Conclusion

Installing and maintaining the SRAM X01 Eagle AXS derailleur demands a methodical, technical approach to harness its full potential. From precise B-gap settings to leveraging wireless micro-adjustments, every detail impacts performance. Whether you’re a seasoned rider or a beginner stepping into electronic shifting, following these steps will ensure your setup runs flawlessly.