How to Install, Adjust, and Maintain the RD-6700 Rear Derailleur

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in Rear Derailleur, Shimano, Ultegra

The Shimano RD-6700 [paid link] Ultegra rear derailleur is a high-performance component designed for smooth and precise shifting in road bike drivetrains. Whether you’re installing it for the first time, fine-tuning adjustments, or performing regular maintenance, getting everything right is crucial for optimal performance.

In this guide, we’ll cover step-by-step installation, adjustment, and maintenance for the RD-6700 [paid link], ensuring your shifting stays crisp and efficient.

Tools Required [paid links]

Before beginning, gather these essential tools:

Understanding the Shimano RD-6700 Rear Derailleur

The RD-6700 [paid link] Ultegra is an advanced 10-speed rear derailleur featuring Shimano’s Wide Link design, which improves rigidity and durability. It is available in two cage lengths:

  • Short cage (SS): Compatible with cassettes up to 28T
  • Medium cage (GS): Supports cassettes up to 30T

Ensuring compatibility with your drivetrain setup is essential for achieving the best shifting performance.

Step-by-Step Installation of the RD-6700 Rear Derailleur

1. Mounting the Rear Derailleur to the Hanger

  1. Align the derailleur’s B-link with the derailleur hanger on your bike frame.
  2. Thread the mounting bolt into the hanger using a 5mm hex key [paid link] and tighten to 8–10 Nm.
  3. Ensure the derailleur pivots freely without binding.

2. Installing the Chain

  1. Determine the correct chain length by wrapping the chain around the largest chainring and largest cassette cog, then adding two extra links.
  2. Use a chain tool to cut the chain to size.
  3. Install the chain and secure it using a quick link or Shimano chain pin.

3. Connecting the Shift Cable

  1. Shift the rear shifter to the smallest cog (highest gear).
  2. Route the cable through the derailleur’s cable fixing bolt and pull it tight.
  3. Secure the bolt using a 5mm hex key [paid link], tightening it to 5–7 Nm.

Adjusting the RD-6700 Rear Derailleur for Optimal Performance

1. Setting the High Limit Screw

  • Rotate the high limit screw (H) clockwise or counterclockwise to align the jockey wheel directly under the smallest cog.
  • Ensure the derailleur does not shift past the cog, preventing the chain from dropping.

2. Setting the Low Limit Screw

  • Shift to the largest rear cog.
  • Adjust the low limit screw (L) until the jockey wheel is aligned with the largest cog.
  • This prevents the chain from over-shifting into the spokes.

3. Fine-Tuning Cable Tension

  • Shift through the gears and check for hesitation or slow shifting.
  • Use the barrel adjuster (near the shifter or derailleur) to make small adjustments:
    • Turn counterclockwise to increase tension (if shifting is sluggish).
    • Turn clockwise to decrease tension (if shifting overshoots).

4. Setting the B-Tension Screw

  • This screw controls the gap between the guide pulley and the largest cassette cog.
  • Turn clockwise to move the derailleur away from the cassette (useful for larger cogs).
  • Turn counterclockwise to move it closer (for faster shifting).

Maintenance Tips for Long-Lasting Performance

1. Cleaning and Lubrication

  • Wipe down the derailleur with a degreaser and a rag to remove dirt buildup.
  • Apply light lubricant to the jockey wheels and pivot points to keep shifting smooth.

2. Checking for Wear and Tear

  • Inspect the jockey wheels for excessive wear or looseness.
  • Check the cables and housing for fraying or corrosion, replacing them if necessary.

3. Chain and Cassette Inspection

  • A worn chain can degrade shifting performance and wear out the cassette prematurely.
  • Use a chain checker tool and replace the chain if wear exceeds 0.5% elongation.

Troubleshooting Common Issues

1. Slow or Inconsistent Shifting

  • Check cable tension and adjust using the barrel adjuster.
  • Inspect for dirt buildup in the derailleur pivots or damaged shift housing.

2. Chain Skipping on the Cassette

  • Ensure chain and cassette are not worn out.
  • Check derailleur alignment; a bent hanger can cause erratic shifting.

Comparison: RD-6700 vs. RD-6800

If you’re considering an upgrade, the RD-6800 [paid link] Ultegra offers:

  • 11-speed compatibility (vs. 10-speed for RD-6700)
  • Shadow design for better aerodynamics and crash resistance
  • Lighter weight and improved shifting precision

Final Thoughts

Proper installation, adjustment, and maintenance of the Shimano RD-6700 Ultegra rear derailleur will ensure smooth, precise shifting and a long lifespan. Regular cleaning, lubrication, and cable tension checks will help keep your drivetrain performing at its best.

By following this guide, you can maximize performance, prevent shifting issues, and extend the life of your RD-6700 derailleur.