The Technology Behind Force XPLR eTap AXS Rear Derailleurs

Introduction

The SRAM Force XPLR eTap AXS [paid link] rear derailleur is a cutting-edge component designed to meet the demands of modern gravel and adventure cyclists. This rear derailleur integrates seamlessly with SRAM’s AXS electronic shifting system, offering precise gear transitions, enhanced durability, and simplified maintenance. This guide provides a detailed exploration of the technology behind the Force XPLR eTap AXS rear derailleur, covering installation, adjustment, troubleshooting, and optimization tips.

Installation of the Force XPLR eTap AXS Rear Derailleur

Installing the SRAM Force XPLR eTap AXS rear derailleur is straightforward, especially when following the AXS ecosystem’s design for simplicity and ease of use. Here’s a step-by-step guide:

Prepare the Bike: Ensure your bike is on a stable workstand, and the drivetrain is clean.
Remove the Old Derailleur: If replacing an existing derailleur, remove it using a 5mm Allen wrench to unscrew the derailleur mount bolt.
Attach the Force XPLR eTap AXS Derailleur: Position the derailleur on the derailleur hanger and tighten the mounting bolt securely.
Install the AXS Battery: The Force XPLR derailleur relies on SRAM’s eTap AXS wireless system. Slide the AXS battery into the derailleur’s battery compartment, ensuring it is locked in place.
Route the Chain: Install the chain through the derailleur’s jockey wheels and ensure it runs smoothly through the entire drivetrain.
Adjust the B-Screw: The B-screw on the derailleur controls the distance between the derailleur and the cogs. Adjust it to achieve optimal shifting performance.

Once the derailleur is mounted, use the AXS mobile app to complete the configuration and pairing of the derailleur with other components.

Adjustment of the Force XPLR eTap AXS Rear Derailleur

Proper adjustment ensures that the SRAM Force XPLR eTap AXS rear derailleur performs at its best, providing quick and reliable shifts. Follow these steps to adjust the derailleur:

Front and Rear Shifter Calibration

Pair the Rear Derailleur: Using the AXS app, connect the rear derailleur to your mobile device. Follow the on-screen instructions to pair it with your shifters.
Set the Limit Screws: Ensure that the limit screws are set correctly to prevent the derailleur from overshifting or shifting too far. This will ensure smooth transitions across the entire cassette.
Fine-Tuning the Shift Performance: Adjust the indexing and trim functions in the AXS app to achieve seamless gear changes. The app will allow you to fine-tune the derailleur’s movement to prevent chain rub or skipping.

Derailleur Alignment

Ensure that the derailleur hanger is straight. A bent hanger can cause misalignment, resulting in poor shifting performance. If necessary, use a derailleur hanger alignment tool to correct any bends before continuing.

Chain Length

For optimal performance, the chain length should be adjusted based on the size of your cassette. For the Force XPLR derailleur, it’s essential to ensure that the chain is long enough to handle the largest cog without overstretching, but not so long that it causes poor shifting when on the smallest cog.

Maintenance of the Force XPLR eTap AXS Rear Derailleur

Maintaining the SRAM Force XPLR eTap AXS rear derailleur is relatively simple due to the robust construction and wireless design. Regular maintenance will extend the lifespan of the component and keep your shifting smooth.

Clean the Derailleur Regularly: Use a soft brush and mild degreaser to clean the derailleur body, jockey wheels, and chain. Avoid direct water contact with the battery compartment and electronic components.
Lubricate the Chain: Keeping the chain properly lubricated ensures smooth shifting and minimizes wear on the derailleur’s jockey wheels.
Check the Battery: Periodically check the charge level of the AXS battery to ensure it doesn’t run out during a ride. The app provides notifications when the battery is running low.
Inspect for Wear and Tear: Over time, the jockey wheels and derailleur hanger may wear out. Regularly inspect these parts and replace them when necessary.
Firmware Updates: SRAM releases firmware updates for their AXS system. Regularly check for updates through the AXS app to ensure your rear derailleur operates with the latest software.

Troubleshooting Common Set-Up Issues

While the Force XPLR eTap AXS rear derailleur is designed to function flawlessly, occasional issues may arise. Here are some common problems and solutions:

Shifting Delays: If there’s a delay in shifting, it may indicate that the derailleur’s battery is low. Ensure the battery is fully charged, and check for any interference with the signal from the AXS shifters.
Skipping Gears: If the derailleur is skipping gears, check the chain length, and ensure that the limit screws are properly set. Additionally, inspect the derailleur hanger for alignment issues.
Unresponsive Shifts: If shifts are unresponsive or erratic, try re-pairing the derailleur with the AXS app. This can resolve any software-related issues.
Chain Rub: If you notice chain rub on the front derailleur or during shifts, fine-tune the indexing through the AXS app to achieve better chain clearance.

Customization and Optimization for Better Performance

To get the most out of the SRAM Force XPLR eTap AXS rear derailleur, consider the following customization and optimization tips:

Fine-Tune Shifting in the AXS App

The AXS app allows for precise customization of your shifting preferences. You can adjust:

Shift Speed: Modify how quickly the derailleur moves between gears.
Trim Functions: Fine-tune the derailleur to prevent chain rub or excessive noise.
Di2-Like Behavior: Adjust the system to function in a manner similar to Shimano’s Di2 if desired.

Derailleur Hanger and Frame Considerations

When selecting your frame or derailleur hanger, make sure it is compatible with the Force XPLR eTap AXS rear derailleur. Some frames have specific tolerances or derailleur hanger shapes, so verifying compatibility ensures smooth installation and reliable shifting performance.

Experiment with Gear Ratios

The Force XPLR eTap AXS rear derailleur is designed for gravel riding, which often requires a wider range of gears. Experimenting with different gear ratios can provide better performance, whether you’re tackling steep climbs or fast descents. Consider pairing the rear derailleur with a cassette that complements your riding style.

Comparison with Similar Models

When comparing the SRAM Force XPLR eTap AXS rear derailleur with other models in the market, such as the SRAM Rival AXS or Shimano GRX Di2, there are several key distinctions:

Technology: The Force XPLR eTap AXS utilizes the same AXS wireless technology as the higher-end SRAM Red and Force models, offering precise, immediate shifting.
Compatibility: The Force XPLR is optimized for wide-range gravel cassettes, offering better performance over a broader gear range compared to the Rival AXS model.
Weight: While the Force XPLR is slightly heavier than the SRAM Red AXS, it strikes a balance between weight and durability for gravel use.
Price: The Force XPLR is priced between the SRAM Rival and Red models, making it a middle-ground option for serious gravel riders.

Understanding Compatibility with Other Drivetrain Components

The Force XPLR eTap AXS rear derailleur is designed to work within the AXS ecosystem, meaning it is fully compatible with other SRAM AXS components, including shifters, chainrings, and the AXS power meter. It is also compatible with other 12-speed SRAM cassettes, making it highly versatile. However, it is important to ensure that your frame and cassette match the requirements for optimal performance.

The derailleur is best paired with a wide-range cassette (10-36t or 10-42t) and works seamlessly with SRAM’s Wide-Link system, designed specifically for gravel and adventure setups. The Force XPLR’s design ensures smooth shifting under load, ideal for the variable conditions of gravel and off-road cycling.