Review: Performance and Durability of Apex XPLR Rear Derailleurs

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The SRAM Apex XPLR [paid link] rear derailleur is engineered for gravel riders and cyclists who require precision shifting and reliability in tough conditions. This rear derailleur is part of the Apex series, designed specifically to optimize performance for wider gear ranges and off-road adventures. In this guide, we will explore the key features, installation, maintenance, troubleshooting, and customization of the Apex XPLR rear derailleur.

Key Features of the Apex XPLR Rear Derailleur

The SRAM Apex XPLR rear derailleur is a pivotal component for gravel bikes, thanks to its robust design and wide compatibility with gravel-specific drivetrains. It is optimized for 1x drivetrains with a wide-range cassette, providing cyclists with smoother shifting and better performance on variable terrain. The Apex XPLR features an advanced clutch mechanism that improves chain stability, reducing chain slap and maintaining performance on rough trails.

Notable Features:

  • Wide Compatibility: Compatible with wide-range cassettes up to 11-42t, ideal for off-road and gravel riding.
  • X-Actuation Technology: Offers precise and consistent shifting performance across all gears.
  • Cage Length Options: The Apex XPLR comes in a medium cage length, making it ideal for gravel and mixed-terrain setups.
  • Clutch Mechanism: Reduces chain slap, keeping the drivetrain quiet and secure during rough rides.
  • Durability: Designed to withstand harsh conditions, with a weather-resistant construction.

Installation of the Apex XPLR Rear Derailleur

Installing the SRAM Apex XPLR rear derailleur is a straightforward process, provided you have the necessary tools and follow the correct procedures. Below are the steps to ensure a proper installation.

Tools Required:

  • 5mm Allen wrench
  • 2.5mm Allen wrench
  • Torque wrench
  • Screwdriver (flathead)
  • Chain checker tool
  • 11-speed chain (compatible with the XPLR derailleur)

Installation Steps:

  1. Remove the Old Derailleur: If you’re replacing an existing derailleur, use the 5mm Allen wrench to remove the derailleur hanger bolt. Then, carefully remove the chain from the derailleur.
  2. Mount the New Derailleur: Align the derailleur with the derailleur hanger. Use the 5mm Allen wrench to securely fasten the derailleur to the hanger. Ensure that the derailleur is mounted in the correct orientation.
  3. Install the Chain: Feed the chain through the derailleur’s jockey wheels and ensure it is routed correctly. If necessary, shorten the chain to fit the new drivetrain by removing any extra links.
  4. Set the B-Screw: Use a 2.5mm Allen wrench to adjust the B-screw for proper clearance between the top jockey wheel and the cassette. This adjustment ensures smooth shifting and avoids interference.
  5. Adjust the High and Low Limit Screws: Use a flathead screwdriver to adjust the high and low limit screws. The high limit screw ensures the derailleur doesn’t shift beyond the smallest cog, while the low limit screw prevents the derailleur from overshooting the largest cog.
  6. Test the Shifting: Once the derailleur is securely installed and adjusted, shift through all gears to ensure smooth and consistent performance. Fine-tune the indexing if necessary by adjusting the barrel adjuster.

Maintenance of the Apex XPLR Rear Derailleur

To ensure the long-lasting performance of your SRAM Apex XPLR rear derailleur, regular maintenance is essential. Routine checks and proper cleaning can help prevent wear and maintain efficient shifting.

Key Maintenance Tips:

  • Clean the Derailleur Regularly: After every muddy or wet ride, clean the derailleur with a degreaser and a soft brush. Remove dirt and grime to prevent buildup that could interfere with shifting.
  • Lubricate the Chain: Apply lubricant to the chain after each ride. A well-lubed chain reduces friction, prevents rust, and extends the lifespan of the derailleur.
  • Check the Tension of the Clutch: The clutch mechanism helps keep the chain tight and stable. Periodically check the clutch’s tension and adjust it according to the manufacturer’s specifications to ensure proper chain retention.
  • Inspect for Damage: Regularly check for any signs of damage or wear on the derailleur, especially after rides on rough terrain. Look for bent hangers, cracked derailleur cages, or worn jockey wheels.

Troubleshooting Common Set-Up Issues

Even with precise installation, there may be instances when the Apex XPLR rear derailleur requires troubleshooting. Below are some common issues and solutions.

1. Poor Shifting Performance

  • Issue: Inconsistent shifting or skipping gears.
  • Solution: Check for proper derailleur alignment and ensure the derailleur hanger is not bent. Adjust the indexing using the barrel adjuster and ensure the chain is properly sized.

2. Chain Slap or Chain Drop

  • Issue: Excessive chain noise or the chain falling off the cassette.
  • Solution: Increase clutch tension if it feels too loose. Ensure the chain is properly sized and the derailleur cage is not bent.

3. Skipping or Dropping to Large Gear

  • Issue: The derailleur jumps to a large cog under load.
  • Solution: Check the limit screws and make sure the B-screw is correctly set. Inspect the derailleur for any obstructions or damage.

4. Unusual Noises or Grinding

  • Issue: Grinding or rubbing noises when shifting.
  • Solution: Check for dirt or debris in the derailleur and jockey wheels. Clean and lubricate the derailleur thoroughly to remove any buildup.

Customization and Optimization for Better Performance

The SRAM Apex XPLR rear derailleur is designed to perform well out of the box, but there are several ways to customize it for enhanced performance, particularly for specific riding conditions.

Customization Tips:

  • Upgrade to a Wider Cassette: If you want a broader gear range for tougher climbs or faster descents, consider pairing the Apex XPLR derailleur with a larger cassette. The 11-42t range is a great option for gravel cyclists seeking more versatility.
  • Adjust the Chainline: Fine-tuning the chainline can improve drivetrain efficiency. If you experience uneven wear on your cassette or chain, adjusting the bottom bracket or crankset can help align the drivetrain for smoother performance.
  • Switch to a More Durable Chain: For riders in rugged conditions, consider using a more robust chain designed for off-road use. This can help reduce wear and tear on the derailleur and improve shifting under load.

Comparison with Similar Models

When comparing the SRAM Apex XPLR rear derailleur to other similar models in the SRAM lineup, such as the SRAM Rival or Force 1x rear derailleurs, the Apex XPLR offers a good balance of performance and affordability. While the Force and Rival derailleurs might offer more advanced features like smoother shifting under high loads, the Apex XPLR is designed with durability in mind, making it an excellent choice for gravel and adventure cyclists.

The Apex XPLR also stands out for its robust clutch mechanism, which is not always present in lower-tier models. Its wide compatibility with various gear setups and reliability in harsh conditions make it a preferred option for cyclists looking to venture off the beaten path.

Compatibility with Other Drivetrain Components

The Apex XPLR rear derailleur is designed to be compatible with SRAM’s 1x drivetrains, particularly those with wide-range cassettes. Its compatibility extends to SRAM 11-speed drivetrains, offering smooth and precise shifting across various gear configurations. When pairing the Apex XPLR with other components, ensure that the front chainring, bottom bracket, and cassette are designed for 1x setups to achieve the best performance.

Important Compatibility Considerations:

  • Cassettes: The Apex XPLR is optimized for cassettes with an 11-42t range, ensuring proper chain movement and smooth shifting.
  • Cranksets: The derailleur is ideal for 1x crankset systems, and combining it with SRAM’s 1x chainring ensures optimal shifting performance.
  • Chains: Use an 11-speed chain for compatibility with the derailleur’s shifting system.

Conclusion

The SRAM Apex XPLR rear derailleur is a high-performing and durable component for gravel and adventure cyclists. With its robust clutch system, wide compatibility, and smooth shifting, it is an excellent choice for riders seeking reliability and efficiency on rough terrain. Proper installation, regular maintenance, and occasional adjustments will ensure the derailleur performs at its best for years to come. Whether you are upgrading your drivetrain or building a new gravel bike, the Apex XPLR offers a solid and dependable option for serious riders.