Fixing Chain Drops on Gravel Bikes with Ekar 13 RD Rear Derailleurs

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The Campagnolo Ekar 13 RD [paid link] rear derailleur is a premium component designed specifically for gravel and all-road bikes. One common issue gravel bike riders face is chain drops, which can occur when shifting under load or when riding on rough terrain. In this guide, we will walk through how to prevent and fix chain drops while using the Ekar 13 RD rear derailleur. We will cover installation, adjustment, troubleshooting, and tips for optimal performance.

Understanding the Ekar 13 RD Rear Derailleur

The Campagnolo Ekar 13 RD rear derailleur is a 13-speed derailleur designed for gravel bike applications. It utilizes a precise and durable design suited for rough terrain, offering smooth shifting performance with minimal maintenance. The Ekar 13 RD features a large pulley cage, which helps with chain retention, especially when using a wide-range cassette.

Chain drops, although rare with properly adjusted components, can occur in certain conditions. These can be caused by improper derailleur settings, incorrect chain length, or issues with chainline alignment. With the right adjustments, the Ekar 13 RD can be optimized to avoid these issues.

Tools Required

To adjust the Ekar 13 RD rear derailleur and address chain drops, the following tools are recommended:

  • 5mm Allen wrench
  • 3mm Allen wrench
  • Chain checker tool
  • Torque wrench
  • Screwdriver (flathead and Phillips)
  • Bike stand or rear wheel lift
  • Lubricant for chain and derailleur

Installing the Ekar 13 RD Rear Derailleur

Proper installation of the Ekar 13 RD is crucial for optimal performance and preventing chain drops. Below are the key steps to ensure the derailleur is installed correctly:

  1. Remove the old derailleur: Use a 5mm Allen wrench to remove the bolt securing the old derailleur to the derailleur hanger.
  2. Install the derailleur hanger: Make sure the derailleur hanger is correctly aligned and securely fastened. If the hanger is bent, it will affect shifting and cause chain drop issues.
  3. Attach the Ekar 13 RD: Use the 5mm Allen wrench to secure the Ekar 13 RD rear derailleur to the derailleur hanger. Tighten the bolt to the manufacturer-recommended torque specifications.
  4. Route the chain: Pass the chain through the jockey wheels of the derailleur and ensure it is routed through the front and rear chainrings and cassette without any twists.
  5. Set up the rear shifter: Install the shifter on the handlebars and route the shift cable properly to the derailleur. Tighten the cable at the derailleur with the 3mm Allen wrench, ensuring that there is sufficient tension.

Adjusting the Ekar 13 RD Rear Derailleur to Prevent Chain Drops

Proper derailleur adjustment is essential to ensure smooth shifting and avoid chain drops. Follow these steps to adjust your Ekar 13 RD:

1. Set the B-Screw:

The B-screw adjusts the distance between the top jockey wheel of the derailleur and the cassette. For optimal performance, the jockey wheel should be positioned 5-6mm away from the largest cog. Tighten or loosen the B-screw as needed to achieve this distance.

2. Adjust the High and Low Limit Screws:

The high and low limit screws prevent the derailleur from overshooting the largest or smallest cogs, which can cause chain drops.

  • High limit screw: This controls the maximum travel of the derailleur in the smallest cog. Ensure the derailleur aligns perfectly with the smallest cog when in the highest gear.
  • Low limit screw: This controls the derailleur’s travel on the largest cog. The derailleur should line up with the largest cog without overshooting it, which can cause the chain to derail.

3. Set the Tension of the Derailleur Cable:

If the derailleur cable tension is too loose or too tight, it can cause mis-shifts, resulting in chain drops. To set proper tension, shift to the middle cog, and adjust the barrel adjuster until the derailleur moves smoothly across the cassette without hesitation.

4. Check the Chain Length:

An excessively long or short chain can cause improper shifting and chain drops. Check the chain length by shifting to the smallest chainring and largest cog, and ensure that the derailleur can accommodate the chain without overstretching or slack. Use a chain checker tool to measure chain wear and replace the chain if necessary.

Troubleshooting Chain Drops with the Ekar 13 RD Rear Derailleur

Even with proper installation and adjustment, chain drops can still occur under certain conditions. Here are some common causes and solutions:

1. Worn or Misaligned Chainring:

If the chainring teeth are worn or the chainring is misaligned, the chain may fail to engage properly, leading to drops. Inspect the chainring for signs of wear or damage, and replace or realign as necessary.

2. Incorrect Chainline:

A misaligned chainline can cause the chain to derail under load. Ensure that your bottom bracket and crankset are properly installed and that the chainline is straight.

3. Excessive Chain Slack:

Too much slack in the chain can result in dropped chains. Make sure the chain is the correct length and properly tensioned. If the chain is too long, remove any excess links.

4. Derailleur Hanger Misalignment:

A bent derailleur hanger can lead to poor shifting and chain drops. Use a derailleur hanger alignment tool to check for any bends or misalignments. If the hanger is bent, straighten or replace it.

5. Chain Lube Issues:

A dry or overly lubricated chain can cause skipping or dropping. Clean and lubricate the chain regularly to ensure smooth operation.

Customizing the Ekar 13 RD for Better Performance

Customizing your Ekar 13 RD can help enhance shifting performance and reduce the likelihood of chain drops:

  1. Upgrade the Cassette: Choose a wide-range cassette that suits your riding style. A wider range gives you more options for gearing and improves chain retention on rough terrain.
  2. Optimize Shifting with a Short Cage Derailleur: If you primarily ride on smoother terrain, switching to a short cage derailleur may improve shifting speed and reduce chain slack.
  3. Fine-Tune Shifter Position: Adjust the position of your shifter on the handlebars for ergonomic comfort and smoother shifting, especially during long rides.

Compatibility of the Ekar 13 RD with Other Drivetrain Components

The Campagnolo Ekar 13 RD is designed to be compatible with Campagnolo’s 13-speed groupset. However, it may not be compatible with components from other brands unless explicitly designed for use with the Ekar system. To ensure proper functionality, always pair the Ekar 13 RD with the correct Campagnolo shifters, cassettes, and chains. Using non-compatible components can lead to poor shifting performance and increased chances of chain drops.

Conclusion

The Campagnolo Ekar 13 RD rear derailleur is a high-performance component built for gravel riding, offering excellent shifting capabilities and chain retention. By carefully installing, adjusting, and maintaining your Ekar 13 RD, you can reduce the chances of chain drops and ensure a smooth and enjoyable ride. Whether you’re on smooth gravel paths or tackling technical terrain, proper derailleur setup and maintenance are essential for optimal performance.