Review: Performance and Durability of Apex XPLR AXS (12-speed) Rear Derailleurs

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The SRAM Apex XPLR [paid link] AXS (12-speed) rear derailleur is a cutting-edge component designed for gravel and road bike enthusiasts who demand high performance and reliability. This model offers an advanced, wireless shifting system with enhanced durability to handle rough terrains and challenging conditions. In this detailed review, we’ll examine the installation, adjustment, maintenance, troubleshooting, and performance characteristics of the Apex XPLR AXS rear derailleur to help cyclists get the most out of their riding experience.

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

Tools Required:

  • 5mm Allen wrench
  • 2mm Allen wrench
  • Torque wrench
  • Chain tool
  • Battery charger (AXS system)
  • Screwdriver
  • Torque setting tool

Step-by-Step Installation Process:

  1. Mount the Derailleur:
    • Use the 5mm Allen wrench to attach the Apex XPLR AXS rear derailleur to the derailleur hanger.
    • Tighten the bolt to the manufacturer’s recommended torque value to ensure a secure connection.
  2. Install the Chain:
    • Use the chain tool to install a compatible 12-speed chain onto the bike. Make sure to route the chain through the derailleur cage and ensure it is properly threaded around the chainrings and cassette.
  3. Attach the AXS Battery:
    • Slide the AXS battery into the derailleur mounting port. Ensure it clicks securely in place. The system uses Bluetooth, so no physical wiring is required.
  4. Position the Derailleur:
    • Set the derailleur in the correct position relative to the cassette, ensuring there’s enough clearance for smooth shifting.
  5. Connect the AXS System:
    • Pair the rear derailleur with your AXS controller via Bluetooth. Follow the pairing instructions provided in the AXS app to synchronize the system.
  6. Test the System:
    • Manually shift through all the gears to verify that the derailleur moves smoothly across the cassette and that no shifting errors occur.

Adjustment and Fine-Tuning

Cage B-Tension Adjustment:

To achieve the best shifting performance, adjusting the cage B-tension screw is critical. This ensures the derailleur aligns properly with the cassette, preventing noise and chain wear.

  • Begin by shifting to the largest cog on your cassette.
  • Use a 2mm Allen wrench to adjust the B-tension screw, ensuring the derailleur cage is parallel to the largest cog.
  • Test the system by shifting through the range to ensure smooth transitions.

Limit Screw Adjustment:

To avoid the derailleur overshooting into the spokes or dropping the chain, fine-tuning the limit screws is essential.

  • Use the screwdriver to adjust the high and low limit screws (marked as “H” and “L”).
  • Adjust the low screw first to ensure the derailleur moves smoothly to the smallest cog, then adjust the high screw for the largest cog.
  • Perform a full gear range test and make additional adjustments as necessary.

Fine-tuning Shifting with AXS App:

The AXS app allows you to calibrate the derailleur wirelessly. By selecting the “Calibrate” option in the app, you can fine-tune the derailleur’s position without needing to manually adjust screws. This can help improve shift accuracy and prevent misalignment.

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

Regular Maintenance:

To ensure the longevity of your SRAM Apex XPLR AXS rear derailleur, it is essential to perform routine maintenance. Clean the derailleur regularly using a soft brush and mild degreaser to remove dirt and grime that can affect shifting performance.

  • Clean the derailleur body and jockey wheels.
  • Check for chain wear and replace it when necessary to avoid skipping gears or chain drops.
  • Inspect the derailleur hanger for any signs of bending or wear, and replace if damaged.

Battery Maintenance:

Since the Apex XPLR AXS relies on a wireless battery system, checking the battery charge regularly is important. The AXS battery is rechargeable and can last for a considerable number of shifts before needing a recharge.

  • Keep the battery charged using the AXS charger to ensure optimal performance.
  • Always store the bike with a fully charged battery if you expect to go on long rides.

Checking and Replacing Cables:

While the AXS system is wireless, the system still relies on a battery connection to maintain communication with the derailleur. Make sure the battery is properly maintained and replace any damaged or worn-out connectors.

Troubleshooting Common Set-up Issues

1. Poor Shifting Performance:

If your shifting feels sluggish or erratic, the first step is to check the battery charge. A low battery can lead to poor performance. If the battery is sufficiently charged and the issue persists, check the alignment of the derailleur and adjust the B-tension screw for better performance.

2. Dropped Chain or Gears Skipping:

Skipping gears or chain drops are usually a result of a misaligned derailleur or worn chain. Inspect the derailleur hanger, check for any bends or damage, and realign it. Replacing a worn chain may also solve the issue.

3. Bluetooth Connection Problems:

If the derailleur is not connecting to the AXS app, ensure the battery is sufficiently charged and reset the system. Re-pairing the system with the app should resolve most connection problems.

Customization and Optimization

1. Fine-Tuning Shift Speed:

For riders seeking faster, more responsive shifts, the Apex XPLR AXS system allows you to adjust the shift speed via the AXS app. Adjusting the shift speed setting can improve the overall efficiency of the derailleur during rapid gear changes, such as on steep climbs or fast descents.

2. Jockey Wheel Size:

By customizing the jockey wheels on the Apex XPLR AXS, riders can optimize chain retention and reduce friction. Larger jockey wheels can help reduce noise and improve durability, while smaller ones can reduce weight.

Comparison with Similar Models

When compared to other rear derailleurs in the SRAM family, such as the SRAM Force AXS and SRAM Red AXS, the Apex XPLR AXS offers a slightly more affordable option while maintaining high-end performance. The Apex XPLR AXS rear derailleur, however, is specifically designed with gravel and adventure riding in mind, offering better handling of rougher terrains and larger cassettes.

  • SRAM Force AXS: While offering similar technology, the Force AXS derailleur is lighter and more refined, making it ideal for performance road bikes.
  • SRAM Red AXS: The Red AXS is the top-tier model, offering the best weight-to-performance ratio but at a higher cost. It’s suitable for competitive road cyclists.
  • Apex XPLR AXS: The Apex XPLR AXS is an excellent choice for cyclists who need durable, reliable performance for gravel and adventure riding at a more accessible price point.

Understanding Compatibility with Other Drivetrain Components

The Apex XPLR AXS rear derailleur is designed to be fully compatible with the SRAM AXS ecosystem. It pairs seamlessly with the SRAM AXS shifters, chain, and cassette. It’s essential to use compatible 12-speed components to ensure optimal performance and shifting accuracy.

  • Cassette Compatibility: It works with the SRAM XG-1270 12-speed cassette, which is designed for gravel riding, offering a wide range of gearing options to handle varying terrains.
  • Shifter Compatibility: The rear derailleur pairs with the SRAM AXS electronic shifters. It’s important to note that the AXS system operates wirelessly, which means the entire drivetrain must be part of the AXS ecosystem for seamless integration.
  • Chain Compatibility: The Apex XPLR AXS requires a 12-speed SRAM chain designed specifically for electronic drivetrains.

By carefully selecting compatible components, you can ensure that the Apex XPLR AXS rear derailleur performs optimally with other drivetrain elements.