DIY Guide to Replacing Derailleur Cables for Apex XPLR

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Replacing the derailleur cables on your SRAM Apex XPLR [paid link] is a straightforward yet essential maintenance task that ensures your drivetrain operates smoothly. A properly installed and adjusted derailleur cable guarantees precise shifting and prolongs the life of your bike’s components. In this guide, we will cover everything you need to know, from the tools required to the step-by-step process of replacing and adjusting the cables.

Tools Required

  • Cable cutters
  • 2.5mm and 5mm Allen wrenches [paid link]
  • Philips screwdriver
  • 3mm or 4mm wrench (depending on your bike’s configuration)
  • New derailleur cables (compatible with SRAM Apex XPLR)
  • New cable housing (optional, if replacing the housing too)
  • Lubricant (for cables)
  • Teflon tape or electrical tape (optional, for sealing cable ends)

Understanding the Apex XPLR Derailleur System

The SRAM Apex XPLR drivetrain is specifically designed for gravel and adventure cycling. It features a 1x system, which simplifies the shifting process by eliminating the front derailleur. Replacing the derailleur cables on this system ensures smoother shifts and prevents the common issues that come with worn or frayed cables, such as skipping gears or poor responsiveness.

Step-by-Step Process for Replacing Derailleur Cables on the Apex XPLR

1. Prepare Your Bike

Before beginning the replacement process, ensure your bike is stable. Place it on a work stand to elevate the rear wheel and make access to the drivetrain easier. Shift your bike into the smallest cog to relieve tension on the derailleur.

2. Remove the Old Cable

  • Detachment from the derailleur: Use a 5mm Allen wrench to unscrew the bolt securing the derailleur cable to the derailleur itself. This allows you to fully release the cable from the derailleur mechanism.
  • Cable housing removal: If you’re also replacing the housing, carefully slide the cable out of the housing. Be sure to take note of any cable stops or bends along the frame that could affect the routing of the new cable.

3. Prepare the New Cable

  • Cut the new cable to the correct length: Using cable cutters, trim the new derailleur cable so that it is slightly longer than the old one. This ensures you have enough slack to easily maneuver the cable through the housing and components.
  • Lubricate the new cable: Apply a small amount of lubricant to the new cable to reduce friction and ensure smooth shifting. It’s important to avoid over-lubricating, as excess lubricant can attract dirt and grime.

4. Install the New Cable Housing (Optional)

  • Measure and cut the housing: If you’re replacing the housing, measure and cut new pieces to match the length of the old ones. Ensure the ends of the housing are clean and square for easy installation.
  • Install the new housing: Slide the housing through the cable guides along the frame, making sure it fits snugly into the cable stops.

5. Route the New Cable

  • Begin by inserting the new derailleur cable into the shifter. On the Apex XPLR system, this usually involves threading the cable through a small entry point on the shifter lever.
  • Next, route the cable through the housing and into the rear derailleur. Be mindful of the routing path and ensure that the cable is not twisted or kinked.
  • Secure the cable with a small amount of tension before tightening the cable bolt on the derailleur. Ensure that the derailleur is in the smallest cog position when you install the cable.

6. Tighten and Adjust the Cable Tension

  • Tighten the cable bolt: Use a 5mm Allen wrench to tighten the cable at the derailleur, but do not overtighten. The cable should be taut enough to engage the derailleur but not overly stretched.
  • Test the shifting: Shift through all the gears to test how well the new cable performs. If you notice any hesitation or skipped gears, fine-tune the cable tension by adjusting the barrel adjuster on the derailleur or the shifter.

7. Cut and Seal the Cable End

Once the cable tension is set and the shifting is smooth, use cable cutters to trim any excess cable. It’s a good idea to use Teflon tape or electrical tape around the cut cable end to prevent fraying. Additionally, you can use a cable end cap for a cleaner finish.

8. Test the Setup

Perform a final check by shifting through the gears several times, ensuring that the derailleur moves freely across the cassette. Pay attention to any clicking sounds, which may indicate misalignment or improper tension. Adjust the barrel adjuster slightly if necessary.

Common Troubleshooting Tips for Apex XPLR Derailleur Cables

  1. Skipping Gears: This could be a sign of improper cable tension or worn-out components. Check the cable tension and ensure the derailleur is properly aligned with the cassette.
  2. Shifting Hesitation: If your shifting is sluggish or hesitant, try cleaning and lubricating the cable. A lack of lubrication can cause friction that hampers smooth shifting.
  3. Excessive Slack or Tightness: If the cable feels too tight or too slack, adjust the barrel adjuster to fine-tune the tension. Ensure the derailleur moves freely in all gears.
  4. Cable Fraying: If you notice cable fraying at the ends, replace the cable and ensure that the ends are sealed properly using tape or end caps to prevent further damage.

Customization and Optimization for Better Performance

The Apex XPLR system is designed to be robust and reliable, but there are a few tweaks you can make for optimal performance:

  • Upgrade the cable housing: Higher-quality housing, such as Shimano’s SIS-SP41 or Jagwire’s L3, can help reduce friction and improve shifting responsiveness.
  • Use friction-reducing lubricants: Specialized lubricants designed for cables can improve shifting performance by reducing internal friction, especially in wet or muddy conditions.
  • Consider cable routing adjustments: Depending on your bike’s frame, adjusting the cable routing to minimize sharp bends can enhance performance and reduce wear over time.

Compatibility with Other Drivetrain Components

The SRAM Apex XPLR is designed to work seamlessly with other SRAM components, especially those in the 1x system. It is most compatible with SRAM’s Force and Rival components, which share similar cable pull ratios and shift characteristics. If you plan to mix brands or upgrade other parts of your drivetrain, be mindful of compatibility issues, particularly with the shifters, derailleurs, and cassettes.

In conclusion, replacing the derailleur cables on your SRAM Apex XPLR is a relatively simple process that can greatly improve the overall performance of your bike. With proper installation, adjustment, and maintenance, your bike will continue to shift smoothly, making for a more enjoyable and efficient ride.