DIY Guide: Optimizing Apex XPLR Rear Derailleur for Gravel Racing

Posted on
in Uncategorized

The SRAM Apex XPLR [paid link] rear derailleur is a standout choice for gravel riders looking for durability, precision, and a smooth shifting experience. Designed specifically for gravel and adventure riding, this derailleur is built to handle rough terrains and provide consistent performance. This guide will help you optimize your Apex XPLR for gravel racing, covering installation, adjustment, maintenance, troubleshooting, and customization.

Tools Required

  • 5mm Allen wrench
  • 3mm Allen wrench
  • Torque wrench (with appropriate range for derailleur)
  • Chain tool
  • Chain checker tool
  • Screwdrivers (flathead and Phillips)
  • Torque screwdriver
  • Lubricant (for derailleur pivots and chain)
  • Rag or towel (for cleaning)
  • Bicycle stand or workbench

Installation of the Apex XPLR Rear Derailleur

The installation of the SRAM Apex XPLR rear derailleur requires attention to detail to ensure proper fitment and optimal performance. Follow these steps for a successful installation:

  1. Remove the Existing Derailleur:
    • If you are replacing an existing derailleur, start by removing it. Use the 5mm Allen wrench to detach the derailleur hanger bolt and the derailleur from the bike.
  2. Install the Derailleur Hanger:
    • If the derailleur hanger is worn or damaged, replace it with a new one to ensure alignment.
  3. Attach the Apex XPLR Rear Derailleur:
    • Position the derailleur on the derailleur hanger and secure it using the 5mm Allen wrench. Tighten to the recommended torque value (usually 8-10 Nm).
  4. Install the Chain:
    • Thread the chain through the derailleur jockey wheels. Ensure the chain passes through the derailleur cage in the correct direction.
  5. Connect the Shifter Cable:
    • Install the shifter cable into the derailleur’s cable anchor and tighten it with a 3mm Allen wrench. Make sure the cable is routed cleanly and without sharp bends.
  6. Test the Initial Setup:
    • Shift through all the gears to check for smooth movement and alignment. If necessary, make minor adjustments to the derailleur hanger.

Adjusting the Apex XPLR Rear Derailleur

Proper adjustment ensures smooth and precise shifting performance. Follow these steps to fine-tune the Apex XPLR derailleur:

1. B-Tension Adjustment:

  • The B-tension screw adjusts the distance between the derailleur and the cassette. For gravel riding, you want the derailleur to have enough clearance from the largest cog.
  • Adjust the B-tension screw by turning it clockwise to bring the derailleur closer to the cassette, or counterclockwise to create more clearance.

2. Limit Screws:

  • Set the upper and lower limit screws to prevent the chain from overshooting the cassette. The upper screw limits the derailleur’s travel towards the smallest cog, and the lower screw limits travel toward the largest cog.
  • Shift to the smallest and largest cogs and adjust the limit screws until the derailleur can’t shift past the desired points.

3. Cable Tension:

  • The correct cable tension ensures the derailleur moves smoothly across the cogs. If your shifts are sluggish or inaccurate, slightly increase or decrease the tension by turning the barrel adjuster at the shifter.
  • Test shifting in all gears after each adjustment to fine-tune the tension.

Maintenance of the Apex XPLR Rear Derailleur

Regular maintenance of your Apex XPLR rear derailleur is crucial for consistent performance and longevity. Here’s how you can keep it in top shape:

1. Clean the Derailleur Regularly:

  • Dirt, mud, and grime can affect the derailleur’s performance. After each ride, especially in muddy conditions, use a rag to wipe down the derailleur.
  • Apply a small amount of lubricant to the derailleur pivots to ensure smooth movement.

2. Check the Chain and Cassette:

  • Periodically check for chain wear using a chain checker tool. Replace the chain if it has stretched beyond the recommended limit.
  • Inspect the cassette for wear. If shifting becomes erratic, it may be time to replace the cassette, especially if teeth have been worn down.

3. Inspect the Hanger and Bolts:

  • The derailleur hanger can bend over time, which can affect shifting accuracy. Inspect the hanger regularly, especially if you notice any shifting issues.
  • Ensure all bolts are torqued to the manufacturer’s specifications to prevent loosening during rides.

4. Replace Worn Jockey Wheels:

  • The jockey wheels, or pulley wheels, in the derailleur cage can wear out after prolonged use. If you hear excessive noise or feel resistance when pedaling, inspect the jockey wheels and replace them if necessary.

Troubleshooting Common Set-up Issues

Sometimes, despite your best efforts, issues can arise with your derailleur setup. Here are some common problems and their solutions:

1. Sluggish Shifting:

  • This can often be attributed to poor cable tension or a dirty derailleur. Recheck the cable tension and clean the derailleur.
  • Also, inspect the chain for wear, as a stretched chain can cause sluggish shifting.

2. Chain Dropping off the Largest Cog:

  • If the chain falls off the largest cog, adjust the lower limit screw to restrict the derailleur’s travel.
  • Check the B-tension adjustment to ensure the derailleur has enough clearance.

3. Skipping Gears or Inconsistent Shifting:

  • Gear skipping can be caused by incorrect derailleur hanger alignment. Use a derailleur hanger alignment tool to check for straightness.
  • If the issue persists, check the condition of your cassette and chain.

4. Noise During Shifting:

  • Grinding or clicking noises during shifting are often caused by misalignment or lack of lubrication. Clean the derailleur and check for any signs of damage or wear on the jockey wheels.
  • Lubricate the derailleur pivots and ensure the chain is properly lubricated.

Customization for Gravel Racing

Optimizing the Apex XPLR rear derailleur for gravel racing means fine-tuning its performance to handle the unique challenges of rough terrains and varying gradients. Here are a few tips to help you get the best out of your derailleur for gravel racing:

1. Optimize the Gear Range:

  • Gravel races often feature steep climbs and technical descents. Opt for a wide-range cassette (e.g., 11-42T) to ensure you have the gearing to handle a variety of terrains.
  • Pair this with a 1x drivetrain for simplicity and reliability, especially when racing on variable terrain.

2. Use a Robust Chain:

  • For the demands of gravel racing, consider using a more robust, gravel-specific chain designed to withstand the increased forces from dirt and mud.
  • Ensure the chain is regularly cleaned and lubricated to prevent excessive wear.

3. Adjust B-Tension for Rough Terrain:

  • Gravel racing often involves bumpier, more unpredictable terrain. Adjust your B-tension slightly for a more forgiving shifting feel on rough roads. A slightly higher clearance between the derailleur and cassette may help prevent the derailleur from hitting the larger cogs during rough terrain.

4. Focus on Durability:

  • Since gravel races are often long and challenging, make sure all components are tightened properly and in good condition. Use high-quality lubricants and check your derailleur, cables, and chain before each race.

Comparing the Apex XPLR Rear Derailleur with Other Models

While the SRAM Apex XPLR rear derailleur is a solid choice for gravel riders, it’s important to understand how it compares to other models in the market. When considering an upgrade or replacement, the Apex XPLR offers several advantages and considerations:

1. Compared to Shimano GRX:

  • The Shimano GRX rear derailleur offers similar gravel-specific performance but tends to have a slightly heavier build. It’s also well-regarded for its smoother shifting feel, though the Apex XPLR’s lightweight design and wide-range gearing may offer a slight edge for racers looking to save weight.

2. Compared to SRAM Rival AXS:

  • The SRAM Rival AXS is a higher-end model with electronic shifting, providing effortless gear changes at the touch of a button. While the Apex XPLR is mechanically operated, it offers a more affordable alternative for riders who don’t need the added complexity of electronic shifting.

Compatibility with Other Drivetrain Components

The Apex XPLR rear derailleur is designed to be compatible with SRAM’s 1x and 2x drivetrains, making it a flexible option for various setups. When considering compatibility with other drivetrain components, the following points should be noted:

1. Cassette Compatibility:

  • The Apex XPLR works with SRAM cassettes ranging from 10 to 42 teeth, providing a good range for gravel riding. Ensure that the cassette you select matches the intended use, especially for long gravel rides or races.

2. Shifter Compatibility:

  • The derailleur pairs perfectly with SRAM’s 11-speed shifters. If you are upgrading from an older SRAM system, make sure your shifters are also compatible with the 11-speed design of the Apex XPLR.

3. Chain Compatibility:

  • The Apex XPLR is compatible with SRAM’s 11-speed chains. Make sure to use a chain designed for use with the 11-speed system to avoid issues with shifting or chain wear.

By following this guide, you can ensure that your SRAM Apex XPLR rear derailleur is optimally installed, adjusted, and maintained for gravel racing. Proper setup and care will provide smoother shifts, increased durability, and a more enjoyable riding experience on rough, gravel-filled terrain.