Expert Opinions: Apex XPLR AXS (12-speed) Rear Derailleurs Reviewed

Posted on
in Uncategorized

Introduction

The SRAM Apex XPLR [paid link] AXS (12-speed) rear derailleur is designed for gravel and adventure riders seeking the perfect balance between durability, performance, and versatility. With a focus on providing smooth shifting across various terrains, this rear derailleur brings the precision of SRAM’s AXS technology to the entry-level gravel bike market. In this guide, we will cover everything you need to know about installing, adjusting, maintaining, and troubleshooting the Apex XPLR AXS (12-speed) rear derailleur, as well as providing insights into its performance and compatibility.

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

Installing the Apex XPLR AXS (12-speed) rear derailleur is a straightforward process, but it requires attention to detail to ensure optimal performance.

Tools Required

  • 5mm Allen wrench
  • Torque wrench (optional but recommended for precise installation)
  • T25 Torx wrench
  • Chain checker tool
  • Bicycle stand or workbench
  • AXS charger (for battery installation)
  • AXS app for setup and firmware updates

Installation Steps

  1. Prepare the Bike: Position your bike on a stable workbench or bike stand. Shift your current derailleur to the smallest cog to release any tension on the derailleur hanger.
  2. Remove the Old Derailleur: If you’re replacing an existing derailleur, use a 5mm Allen wrench to remove the derailleur mounting bolt. Then, carefully disconnect the chain from the derailleur.
  3. Install the Derailleur Hanger: Ensure the derailleur hanger is straight and properly aligned. If the hanger is damaged, replace it before proceeding.
  4. Mount the Apex XPLR AXS Derailleur: Attach the derailleur to the derailleur hanger using the provided mounting bolt. Tighten the bolt securely with a 5mm Allen wrench (ensure the torque specification is followed for optimal performance).
  5. Connect the Chain: Loop the chain through the jockey wheels of the derailleur and reattach it to the bike. Make sure the chain is correctly threaded through all of the gears and the derailleur.
  6. Install the AXS Battery: Connect the AXS battery to the derailleur and charge it using the AXS charger. The AXS battery is essential for controlling the derailleur electronically.
  7. Firmware Setup: Use the SRAM AXS app to update the derailleur’s firmware to the latest version. This will ensure smooth shifting and optimal performance from the get-go.

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

Once the Apex XPLR AXS (12-speed) rear derailleur is installed, you’ll need to perform some basic adjustments to fine-tune the shifting.

High and Low Limit Screws

The first step in adjustment involves setting the high and low limit screws. These screws control the derailleur’s range of movement and prevent the chain from overshooting into the wrong cog.

  1. High Limit: Adjust the high-limit screw to ensure the derailleur stops at the smallest cog. Shift to the smallest cog and then turn the screw clockwise or counterclockwise until the derailleur is correctly aligned with the cog.
  2. Low Limit: Adjust the low-limit screw to set the derailleur’s movement on the largest cog. Shift to the largest cog and adjust the screw to avoid the derailleur over-extending.

B-Tension Screw Adjustment

The B-tension screw controls the gap between the derailleur’s jockey wheels and the cogs. It’s important to ensure this distance is optimal for smooth and quiet shifting.

  1. Shift to the largest cog.
  2. Adjust the B-tension screw by turning it clockwise to increase the gap or counterclockwise to reduce it. Aim for a small gap (roughly 5-6mm) between the jockey wheels and the cog.

Indexing the Gears

For the most precise shifting, the gear indexing should be adjusted properly. Use the barrel adjuster located near the shifter or at the derailleur itself.

  1. Shift through the gears one at a time, adjusting the barrel adjuster as needed to ensure that the derailleur moves smoothly between gears. If the chain skips or doesn’t shift smoothly, fine-tune the barrel adjuster until the shifts are crisp and accurate.

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

Proper maintenance is essential to keeping your Apex XPLR AXS (12-speed) rear derailleur in optimal condition. Regular servicing can prevent wear and tear, enhance performance, and extend the lifespan of your components.

Cleaning

  1. Inspect and Clean the Derailleur: Regularly check for dirt, grime, or debris that may accumulate on the derailleur and jockey wheels. Use a soft cloth or brush to clean the derailleur, and avoid harsh chemicals that could damage the finish.
  2. Lubrication: Lubricate the derailleur’s pivot points with a light oil to prevent rusting and ensure smooth movement. Avoid over-lubricating as it can attract dirt.

Battery Care

Since the Apex XPLR AXS relies on an electronic battery, it’s important to keep the battery charged. The AXS battery is designed to last for a long time, but periodic charging is necessary, especially after long rides or when shifting becomes sluggish. Always use the AXS charger to ensure a proper charge.

Chain and Cassette Maintenance

  1. Chain Wear: Regularly check your chain for wear. An overly stretched chain can lead to poor shifting and premature wear on the cassette and derailleur.
  2. Cassette Condition: Inspect your cassette for worn or damaged teeth. Replacing the cassette when needed will ensure that the derailleur performs at its best.

Troubleshooting Common Set-Up Issues

Even with the best installation, riders may face common issues that hinder the performance of their Apex XPLR AXS (12-speed) rear derailleur. Here are some solutions to these problems:

Chain Skipping or Slipping

  • Cause: A stretched chain, worn cassette, or misaligned derailleur.
  • Solution: Check for chain wear using a chain checker tool. Replace the chain if necessary. Inspect the derailleur alignment, adjust the B-tension screw, and ensure the high and low limit screws are correctly set.

Inconsistent Shifting

  • Cause: Incorrect indexing, misadjusted barrel adjuster, or low battery.
  • Solution: Recheck the indexing and fine-tune the barrel adjuster. Ensure that the battery is fully charged and connected properly.

Derailleur Hitting the Frame

  • Cause: Improper derailleur hanger alignment or incorrect B-tension adjustment.
  • Solution: Use a derailleur hanger alignment tool to check the hanger’s alignment. Adjust the B-tension screw to ensure the derailleur is positioned properly.

Customization and Optimization for Better Performance

While the Apex XPLR AXS (12-speed) rear derailleur is designed for high performance straight out of the box, there are several ways you can optimize it for better shifting and durability:

Upgrade the Chain

Consider using a high-quality chain that is compatible with 12-speed drivetrains. Some chains are designed to provide smoother shifting and better longevity, which can complement the Apex XPLR AXS derailleur’s performance.

Opt for a Wide-Range Cassette

If you’re using the Apex XPLR AXS (12-speed) derailleur for gravel riding or bikepacking, a wide-range cassette is highly recommended. A 10-36T or 10-42T cassette allows for smoother transitions across varying terrains, enhancing the derailleur’s versatility.

Fine-Tune AXS Settings

Through the AXS app, you can customize shift behavior, including shift speeds and feel. Adjusting these settings can make your shifts even more precise, providing a tailored riding experience.

Comparison with Similar Models

When compared to other rear derailleurs within the SRAM lineup, such as the Rival AXS and Force AXS, the Apex XPLR AXS (12-speed) stands out in terms of value for money. While the Rival and Force models offer higher-end features and materials, the Apex XPLR AXS provides a more affordable option without sacrificing too much in terms of performance. It is ideal for gravel riders who want a reliable, durable derailleur that can handle a variety of terrain but don’t need the additional performance enhancements found in more expensive models.

Understanding Compatibility with Other Drivetrain Components

The Apex XPLR AXS (12-speed) rear derailleur is designed to work seamlessly with SRAM’s AXS electronic drivetrain system. It is compatible with SRAM’s 12-speed road and gravel cassettes, but it is important to ensure compatibility with your bike’s chainring and crankset. The AXS system is highly modular, allowing you to mix and match with different SRAM AXS components to create a fully optimized drivetrain.

The Apex XPLR AXS derailleur is also compatible with Shimano 12-speed cassettes when used with a compatible freehub body. However, SRAM’s AXS components work best when used within the same system, ensuring smooth integration and reliable shifting performance.