DIY Guide to Replacing Derailleur Cables for Force eTap AXS (12-speed)

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Replacing the derailleur cables on your SRAM Force eTap AXS 12-speed drivetrain is a necessary maintenance task that ensures smooth shifting performance and longevity of your components. In this guide, we will walk you through the step-by-step process of replacing the derailleur cables on your Force eTap AXS, troubleshooting common issues, and ensuring the best performance for your bike.

Tools Required

  • 5mm Allen wrench
  • 2mm Allen wrench
  • Cable cutters
  • Torque wrench
  • Flathead screwdriver
  • New derailleur cables (12-speed compatible)
  • Cable housing (if necessary)
  • Lubricant (for cable and housing)
  • Teflon tape (optional, for cable housing)

Removing the Old Derailleur Cables

Step 1: Remove the Rear Wheel

Begin by removing the rear wheel from your bike. This provides access to the rear derailleur and the derailleur cable, making the process easier.

Step 2: Disconnect the Battery from the Rear Derailleur

For the SRAM Force eTap AXS system, you must disconnect the battery from the rear derailleur before proceeding. Use the 2mm Allen wrench to detach the battery. This ensures that no electrical power is running through the system during the cable replacement.

Step 3: Remove the Old Derailleur Cable

  • Use the 5mm Allen wrench to loosen the derailleur clamp bolt.
  • Carefully remove the cable from the derailleur by either pulling it out or sliding it through the cable entry point.
  • If you’re replacing the housing as well, follow the cable path to remove the housing from the frame. Use the flathead screwdriver to remove any cable guides or stops if needed.

Preparing and Installing the New Derailleur Cable

Step 4: Prepare the New Cable

  • Unbox your new derailleur cables and cut them to the appropriate length. To ensure proper tension and performance, it’s better to leave a bit of extra cable and trim it down later if necessary.
  • If you are replacing the cable housing, make sure it is cut to the correct length as well. Housing should align smoothly from the frame to the derailleur without sharp bends.

Step 5: Lubricate the Cable and Housing

Before installing the new cable, apply a light layer of lubricant to both the cable and the inside of the housing. This will reduce friction and allow the cable to move more smoothly.

Step 6: Insert the New Cable into the Housing

Insert the new cable into the housing and ensure it is fed through the entire length. Ensure the housing is securely in place on both the frame and the derailleur. If necessary, secure it with cable stops or guides.

Step 7: Attach the Cable to the Derailleur

  • Insert the cable through the cable entry point on the rear derailleur.
  • Tighten the derailleur clamp bolt using the 5mm Allen wrench. Ensure that the cable is seated properly and has no slack, but avoid overtightening the clamp.

Adjusting the Cable Tension

Step 8: Set the Correct Tension

After installing the new cable, adjust the tension using the barrel adjusters located on the derailleur or shifter. To begin with, ensure the chain is in the smallest chainring and cog.

  • Use the barrel adjuster to fine-tune the tension. If the chain struggles to move into higher gears, increase the tension slightly. If the chain hesitates when shifting into lower gears, reduce the tension.

Step 9: Check for Smooth Shifting

After adjusting the cable tension, shift through all the gears to ensure smooth shifting performance. Pay attention to any hesitation, skipping, or misalignment in the shifts. Fine-tune the cable tension as needed by turning the barrel adjuster.

Reconnecting the Rear Derailleur Battery

Step 10: Reconnect the Battery

Once you are satisfied with the cable tension and shifting performance, reconnect the rear derailleur’s battery. Ensure the connection is secure and that no wires are pinched or exposed.

Testing and Fine-Tuning

Step 11: Test the Shifting Performance

With the bike assembled and the rear wheel back in place, test the shifting performance while riding. Start by shifting through all the gears under light pedaling. Pay attention to any changes in performance, including smoothness, precision, or lag between shifts.

Step 12: Fine-Tune as Necessary

If shifting is not as precise as desired, adjust the barrel adjusters slightly. Fine-tuning after a few rides will help the cables break in and settle into their optimal tension.

Troubleshooting Common Issues

  • Skipping or jumping gears: If the chain skips or jumps between gears, it may be a sign of excessive cable slack or incorrect tension. Recheck the cable tension and adjust the barrel adjuster to eliminate slack.
  • Slow or unresponsive shifts: Slow shifts can be caused by poor cable lubrication or friction. Make sure that the cable and housing are adequately lubricated, and check the housing for any signs of wear or kinks.
  • Shifting problems when under load: If the shifting feels sluggish under load, the tension may need to be increased slightly. Additionally, check that the derailleur hanger is straight and the derailleur is properly aligned.

Customization and Optimization

To achieve the best shifting performance with your Force eTap AXS drivetrain, consider these optimization tips:

  • Use high-quality cables and housing: Choosing premium cables and housing can reduce friction and improve shifting precision.
  • Teflon tape: When installing new housing, adding a small amount of Teflon tape inside the housing can reduce friction and prolong cable life.
  • Regular maintenance: Regularly inspect your derailleur cables for wear, and replace them as necessary to ensure consistent shifting performance. Keeping your drivetrain clean and lubricated can also prolong the lifespan of the cables.

Compatibility with Other Drivetrain Components

The SRAM Force eTap AXS (12-speed) system is designed to work seamlessly with other AXS components. However, compatibility with other drivetrains and parts depends on the specific model and brand. When replacing derailleur cables, ensure that your new cables are designed specifically for 12-speed systems, as these cables have a narrower diameter than those used for 11-speed systems. Additionally, using AXS-specific components ensures optimal performance across the entire drivetrain.

Conclusion

Replacing the derailleur cables on your SRAM Force eTap AXS (12-speed) drivetrain is a straightforward task that can be completed with the right tools and careful attention to detail. By following the steps outlined in this guide, you can ensure smooth shifting and optimal performance for your bike. Regular maintenance and proper adjustment will help you get the most out of your components, keeping your bike in top shape for years to come.