How to Replace the CN-HG93 Chain for Better Performance and Longevity

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Replacing a chain at the correct interval is critical to maintaining the performance and longevity of your drivetrain. The Shimano CN-HG93 [paid link] chain, part of Shimano’s 9-speed lineup, is engineered for precision shifting and durability, but like all chains, it wears out over time. Knowing how to properly replace it ensures your entire drivetrain remains efficient and reliable.

Understanding When to Replace the CN-HG93 Chain

A worn chain can cause poor shifting performance and accelerate wear on your cassette and chainrings. Typically, the CN-HG93 [paid link] should be checked for stretch or elongation using a chain checker tool. Shimano recommends replacing the chain when it shows 0.75% elongation for optimal drivetrain preservation.

Indicators that your CN-HG93 [paid link] needs replacement include:

  • Inconsistent or delayed shifting.
  • Excessive chain noise despite proper lubrication.
  • Visible elongation using a wear checker tool.
  • Skipping under load even with a correctly adjusted derailleur.

Regular inspection every 500-1000 km will prevent drivetrain issues and maintain peak efficiency.

Tools Required for CN-HG93 Chain Replacement

  • Chain checker tool.
  • Chain breaker tool (compatible with 9-speed chains).
  • Shimano-approved quick link pliers (if using a quick link).
  • Replacement Shimano CN-HG93 chain.
  • Shimano-approved 9-speed quick link or a Shimano connecting pin.
  • Chain lubricant.
  • Clean rag.

Removing the Old CN-HG93 Chain

Start by shifting your drivetrain into the smallest chainring and smallest cog combination. This relieves chain tension and makes removal easier. If the chain was connected using a quick link, locate it and use quick link pliers to separate it. Otherwise, use a chain breaker tool to push out a pin and break the chain.

Once disconnected, carefully remove the chain from the drivetrain, being cautious not to drop it into the frame or components.

Dispose of the old chain properly, and resist the temptation to reuse any quick links or connecting pins as these are designed for one-time use to ensure safety and performance.

Sizing the New CN-HG93 Chain

Correct chain length is crucial for smooth shifting and drivetrain longevity. Lay the old chain alongside the new one if the old chain was correctly sized, omitting any worn-out stretch. If no reference is available, use the “big-big” method:

  1. Route the new CN-HG93 around the largest front chainring and the largest rear cog (without passing through the rear derailleur).
  2. Bring the ends together and add two full links (one inner and one outer plate) beyond where they meet.
  3. Mark the proper length and remove excess links with a chain breaker tool.

This method ensures the derailleur maintains correct tension without being overstressed.

Installing the New CN-HG93 Chain

Thread the new chain through the front derailleur cage and around the rear derailleur jockey wheels, ensuring proper routing. Shimano’s CN-HG93 chain has directional properties; the outer plates have Shimano logos and should face outward for optimal shifting.

For joining the chain, Shimano offers two methods:

  • Shimano Connecting Pin: Insert the pin into the link, use a chain tool to drive it into place, and then break off the protruding guide section.
  • Shimano Quick Link: Insert each half of the link into the chain ends and snap them together. Apply tension by pedaling to fully engage the link.

Ensure the link or pin is properly seated by rotating the pedals and checking for stiff links or binding. Correct any issues before proceeding.

Post-Installation Adjustment and Inspection

After installation, shift through all gears to ensure smooth and accurate transitions. Inspect the chain for tight links by backpedaling slowly; any hitch or skip indicates a problem at the link, often corrected by manually flexing the chain sideways to loosen a tight joint.

Proper lubrication is essential. Apply a high-quality lubricant evenly across the chain, allowing it to penetrate fully, and wipe off the excess with a clean rag. Over-lubrication can attract dirt and accelerate wear.

Maintenance Tips for Extending CN-HG93 Chain Life

To get the maximum lifespan from your new CN-HG93 chain:

  • Clean and lubricate the chain regularly, especially after riding in wet or dusty conditions.
  • Avoid cross-chaining (e.g., big chainring to big cog) which puts unnecessary stress on the chain.
  • Replace the chain at appropriate wear intervals before it damages the cassette or chainrings.
  • Store your bike indoors to prevent moisture-related corrosion.

With proper maintenance, the Shimano CN-HG93 chain will deliver thousands of kilometers of precise, quiet, and reliable shifting performance.

By following these precise steps, you ensure that your Shimano CN-HG93 chain replacement restores drivetrain efficiency and prolongs the life of your bike’s drivetrain components.