How to Install, Adjust, and Maintain the Shimano CN-6800 Chain

Posted on
in Chains, Shimano, Ultegra

The Shimano CN-6800 [paid link] chain is a vital component of the Ultegra 6800 groupset, offering precise shifting and efficient power transfer for road cyclists. Proper installation, adjustment, and maintenance are crucial to ensuring longevity and optimal drivetrain performance.

In this guide, we’ll walk you through everything you need to know about setting up and maintaining the CN-6800 [paid link] chain to keep your ride smooth and efficient.

Understanding the Shimano CN-6800 Chain

The Shimano CN-6800 is an 11-speed chain designed for Ultegra 6800 drivetrains but is also compatible with other 11-speed Shimano road groupsets. Featuring an asymmetrical plate design, it improves shifting performance, particularly when moving from smaller to larger cogs. The Hollow Pin construction makes it lightweight while maintaining strength, ensuring a balance between durability and weight savings.

Tools Required [paid links]

Before beginning the installation process, ensure you have the following tools:

Step-by-Step Installation of the Shimano CN-6800 Chain

1. Determining the Correct Chain Length

A chain that is too short can damage the derailleur, while an excessively long chain can compromise shifting. To determine the correct length:

  1. Wrap the chain around the largest front chainring and the largest rear cog (without passing through the derailleur).
  2. Add two full links to this length before cutting the chain.
  3. If using a Shimano Quick-Link, account for the link’s additional length.

For a more precise method, consult Shimano’s official chain length chart based on drivetrain configurations.

2. Cutting the Chain

Using a chain tool, cut the CN-6800 to the required length. Ensure the cut is clean to avoid rough edges that can interfere with smooth connection and shifting.

3. Connecting the Chain

You can connect the CN-6800 chain using either:

  • Shimano 11-speed Chain Pin: Insert the pin into the designated hole, use a chain tool to press it in, then snap off the excess.
  • Shimano Quick-Link: Align the ends, insert the link, and snap it into place by pedaling under load until you hear a click.

Shimano recommends using only their proprietary connectors to maintain shifting precision.

Adjusting the Shimano CN-6800 Chain for Optimal Performance

1. Checking Initial Tension

After installation, shift through the gears and observe the chain’s movement. Ensure the derailleur’s jockey wheels keep proper tension on the chain without excessive slack.

2. Fine-Tuning the Rear Derailleur

If shifting feels sluggish or noisy:

  • Adjust the B-tension screw to ensure the chain smoothly moves up and down the cassette.
  • Check for proper chain line alignment to avoid cross-chaining issues.

3. Front Derailleur Positioning

A misaligned front derailleur can cause rubbing or sluggish shifting. To fix this:

  • Ensure the outer plate of the front derailleur is parallel to the chainring.
  • Adjust the low and high limit screws to prevent over-shifting or under-shifting.

Maintaining the Shimano CN-6800 Chain

Regular maintenance ensures the chain lasts longer and shifts smoothly.

1. Cleaning and Lubrication

  • Wipe down the chain after every ride to remove debris and grime.
  • Deep clean the chain every 200-300 miles using a degreaser.
  • Apply a dry or wet lubricant, depending on weather conditions.
  • After lubing, wipe off excess oil to prevent dirt buildup.

2. Checking for Chain Wear

A stretched chain accelerates cassette and chainring wear. Use a chain wear indicator tool every 500 miles to measure elongation. If the chain shows 0.5% wear, it’s time to replace it.

3. Replacing the Chain

When the CN-6800 reaches 0.75% wear, replace it immediately to avoid damaging the cassette and chainrings. Always use a new Shimano chain pin or Quick-Link when installing a replacement chain.

Common Problems and Troubleshooting

1. Noisy Shifting

  • Ensure the chain is clean and properly lubricated.
  • Check derailleur alignment and adjust cable tension if necessary.
  • Verify that the chain is routed correctly through the jockey wheels.

2. Chain Skipping

  • Inspect for chain wear and replace if stretched.
  • Ensure the cassette and chainrings are not excessively worn.
  • Check derailleur hanger alignment.

3. Chain Sucks into Chainstay

This happens when the chain doesn’t disengage from the chainring properly. Fix it by:

  • Cleaning and re-lubricating the chain.
  • Checking for bent chainrings.
  • Adjusting front derailleur alignment.

Shimano CN-6800 Chain vs. Other Models

Compared to other Shimano 11-speed chains like the Dura-Ace CN-HG901 [paid link] or 105 CN-HG600, the CN-6800 offers:

  • Better shifting than the 105 chain due to a refined plate design.
  • More affordable than Dura-Ace while maintaining high performance.
  • Compatible across all Shimano 11-speed road drivetrains.