How to Install Your Apex XPLR AXS (12-speed) Rear Derailleur at Home

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Installing the SRAM Apex XPLR [paid link] AXS (12-speed) rear derailleur is a straightforward process that can be completed at home with the right tools and instructions. This high-performance derailleur is designed for gravel and adventure cyclists, offering precision shifting and enhanced durability. In this guide, we will walk you through the step-by-step process of installation, adjustment, and maintenance for optimal performance.

Tools Required

Before beginning the installation process, gather the necessary tools. The following items will be required to install and set up your Apex XPLR AXS rear derailleur:

  • 5mm Allen wrench
  • 2mm Allen wrench
  • Torque wrench (with 5-6Nm torque setting)
  • Chain checker tool
  • Screwdriver (for limit screws)
  • Shimano/SRAM compatible quick-link or chain tool
  • Small rag or cleaning cloth
  • Bike stand (optional, but recommended)

Installation of the Apex XPLR AXS (12-speed) Rear Derailleur

Step 1: Prepare the Bike

Begin by placing the bike on a stand to ensure stability during installation. Shift the chain to the smallest chainring and rear cog to relieve tension on the derailleur and cassette. This will allow for easier attachment of the derailleur.

Step 2: Remove the Old Rear Derailleur (If applicable)

If you are replacing an existing derailleur, use a 5mm Allen wrench to remove the derailleur hanger bolt. Carefully take off the derailleur and set it aside. Check that the derailleur hanger is straight, as a misaligned hanger can cause shifting issues.

Step 3: Attach the Apex XPLR AXS Rear Derailleur

Position the Apex XPLR AXS rear derailleur on the derailleur hanger. Use the 5mm Allen wrench to securely tighten the derailleur attachment bolt. Ensure the derailleur is oriented correctly, with the jockey wheels aligned vertically.

Step 4: Install the Chain

The Apex XPLR AXS derailleur is compatible with 12-speed chains. Install the chain onto the cassette, ensuring it runs smoothly through the jockey wheels. If using a quick-link, attach it to the chain, making sure it is properly engaged. Use a chain tool to verify that the chain length is correct. A correctly sized chain will allow for smooth shifting across all gears.

Step 5: Set the B-Screw Adjustment

The B-screw adjustment controls the distance between the derailleur and the cassette. Use a 2mm Allen wrench to adjust the B-screw. The general guideline is to set the derailleur body approximately 6-7mm from the largest cog. This ensures smooth shifting and prevents chain rubbing.

Step 6: Install the AXS Battery

The Apex XPLR AXS is wireless and requires a battery for operation. Mount the battery onto the rear derailleur’s battery holder and secure it with the provided screw. Make sure the battery is locked into place and fully charged before proceeding.

Step 7: Install the AXS Controller

The AXS system can be controlled through a compatible shift lever. Install the AXS controller onto the handlebars by following the manufacturer’s instructions. Ensure that the controller is securely mounted and that the wiring is routed properly to avoid interference with cables or the bike’s frame.

Adjusting the Apex XPLR AXS (12-speed) Rear Derailleur

Step 1: Set the Limit Screws

The limit screws prevent the derailleur from shifting the chain beyond the smallest and largest cogs. Use a screwdriver to adjust the high and low limit screws. Shift to the smallest cog in the rear and the largest chainring in the front. Adjust the high limit screw to prevent the derailleur from overshifting. Then, shift to the largest cog and adjust the low limit screw to prevent overshifting into the spokes.

Step 2: Fine-Tune the Barrel Adjuster

The barrel adjuster allows fine-tuning of the shifting tension. If the derailleur is not shifting crisply, adjust the barrel adjuster in small increments to increase or decrease tension. Start by turning the barrel adjuster counterclockwise to increase tension and clockwise to reduce tension.

Step 3: Test Shifting

Shift through all the gears, paying close attention to the transitions between cogs. The shifting should be smooth and crisp, without any hesitation or skipping. If you experience any issues, check the limit screws and barrel adjuster again, and ensure that the chain length is correct.

Troubleshooting Common Set-Up Issues

1. Chain Skipping or Hesitation

If your chain is skipping or hesitating when shifting, the issue is often due to incorrect tension or improper installation of the chain. Double-check the chain length and ensure that the derailleur is properly aligned with the cassette. Additionally, check that the barrel adjuster is properly fine-tuned to ensure the right tension.

2. Chain Dropping Off the Largest Cog

A common issue when installing the Apex XPLR AXS derailleur is the chain dropping off the largest cog. This could be caused by improperly set limit screws. Ensure that the high limit screw is adjusted correctly to prevent overshifting onto the frame or spokes.

3. Shifting Delays or Lag

Shifting delays may occur if the battery is low or if the AXS system has not been properly calibrated. Ensure that the battery is fully charged and that the system is connected to the AXS app for any firmware updates or calibration.

Customization and Optimization for Better Performance

The Apex XPLR AXS derailleur is designed to deliver top-tier performance right out of the box. However, some customization can optimize its performance for your specific riding style:

  • Chainring Size: If you primarily ride on gravel or mixed terrain, opting for a larger or smaller chainring can help optimize gearing for your preferred cadence and power output.
  • B-Screw Adjustment: Fine-tuning the B-screw to perfectly match your cassette size ensures smoother shifting. Experiment with slight adjustments to optimize the gap between the derailleur and the cassette.
  • Battery Placement: The AXS system allows flexibility in battery placement. If you’re looking for a more streamlined setup, consider hiding the battery inside the frame or using a different mounting position that reduces cable interference.

Comparison with Similar Models

The SRAM Apex XPLR AXS (12-speed) is an excellent choice for gravel riders who need reliable, wireless shifting. Compared to other similar models in the SRAM lineup, such as the SRAM Rival AXS, the Apex XPLR offers a more affordable price point while maintaining excellent performance. It’s designed with adventure cyclists in mind, offering a wide gear range and stable performance across various terrains. Riders who want higher-end features, such as smoother shifting in extreme conditions, might opt for the SRAM Force or Red AXS groupsets, but the Apex XPLR remains a top contender in terms of value and reliability.

Understanding Compatibility with Other Drivetrain Components

The Apex XPLR AXS (12-speed) derailleur is designed to work seamlessly with SRAM’s AXS ecosystem. It is compatible with 12-speed chains and cassettes, as well as AXS shift levers. While the system can be used with other 12-speed components from SRAM, it is recommended to use it with other AXS-specific parts for the best performance. If mixing components from other brands, compatibility with the AXS wireless technology should be confirmed.

For optimal shifting performance, it is advisable to pair the Apex XPLR AXS derailleur with a SRAM AXS chain and cassette. This ensures perfect integration with the shifting system and reduces the chance of any setup issues.