The Most Common CN-HG701 Chain Problems and How to Solve Them

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The Shimano CN-HG701 [paid link] chain is a high-performance 11-speed chain designed to deliver smooth, reliable shifting under demanding conditions. However, like any bike component, even the CN-HG701 [paid link] can develop issues if not properly installed or maintained. This guide provides a detailed breakdown of the most common problems encountered with the CN-HG701 [paid link] chain and clear solutions to keep your drivetrain operating at its best.

Understanding the CN-HG701 Chain

The CN-HG701 is engineered with Shimano’s SIL-TEC surface treatment, promoting low friction and extended wear life. It features directional design, meaning that correct orientation during installation is critical for optimal shifting performance. The chain’s strength and design make it compatible with Shimano’s 11-speed road and MTB drivetrains, but only when properly sized and installed.

Chain Skipping Under Load

One of the most frequent complaints with the CN-HG701 is chain skipping, particularly when riding under heavy load or shifting aggressively. This issue usually stems from poor chain and cassette compatibility or improper chain length.

Solutions:

  • Check for Wear: Use a chain checker tool to determine if the chain or cassette is worn. Replace whichever component shows excessive wear.
  • Verify Chain Length: Ensure the chain is sized correctly by wrapping it around the largest chainring and largest cog without passing through the derailleur. Add two full links for the proper length.
  • Confirm Correct Installation Direction: The CN-HG701 has an asymmetrical design. The outer plates should face outward (away from the bike) for optimal engagement with the cogs and chainrings.

Noisy Shifting

Noise during shifting or general drivetrain operation can detract from the riding experience and usually points to either installation errors or lubrication issues.

Solutions:

  • Lubrication: The CN-HG701 benefits from regular lubrication with a quality chain lube. Clean the chain with a degreaser before re-lubricating to prevent dirt build-up.
  • Inspect Alignment: Confirm that the derailleur hanger is straight and the derailleur is properly adjusted. Misalignment can cause the chain to sit poorly on the cassette, leading to noise.
  • Recheck Chain Direction: As the CN-HG701 is directional, verify that the chain is installed correctly. A backward chain will shift poorly and produce excessive noise.

Premature Chain Wear

Although designed for durability, the CN-HG701 chain can wear prematurely if not maintained or installed properly.

Solutions:

  • Regular Cleaning and Lubrication: Road conditions affect wear rates. Clean the chain every 150-200 miles in dry conditions, more often in wet or muddy conditions.
  • Avoid Cross-Chaining: Running the chain on extreme gear combinations (e.g., big ring and largest cog) increases stress and accelerates wear. Stay within a more moderate gear range.
  • Monitor Chain Stretch: Check chain wear every 500 miles with a chain checker. Replacing the chain before it stretches beyond 0.75% can prevent cassette and chainring damage.

Chain Drop

Unexpected chain drops—where the chain falls off the chainring—can be dangerous and usually result from improper chain tension or front derailleur issues.

Solutions:

  • Adjust Front Derailleur: Make sure the derailleur cage is properly aligned with the chainrings and that limit screws are correctly set to prevent overshifting.
  • Tension and Length: Incorrect chain length can cause poor tension. A too-long chain increases slack, making chain drops more likely.
  • Check for Worn Components: Inspect the chainring teeth for wear. Sharp, pointed teeth can fail to hold the chain effectively.

Difficulty Connecting the Chain

The CN-HG701 is often installed with Shimano’s SM-CN900 Quick-Link or a standard chain pin. Improper connection can lead to stiff links or chain failure.

Solutions:

  • Use the Right Tools: A chain tool is necessary for pressing pins properly; Quick-Links require chain pliers for secure closure.
  • Ensure Correct Pin Insertion: If using a pin, push it in until flush with the outer plate, then snap off the guide portion.
  • Quick-Link Installation: Confirm the Quick-Link is fully seated by applying a strong pedal stroke while holding the rear brake to lock the link into place.

Chain Binding or Tight Links

A tight link in the CN-HG701 chain can lead to skipping or a clunky drivetrain feel.

Solutions:

  • Flex the Tight Link: Manually flex the chain laterally back and forth at the tight link to loosen it.
  • Lubricate Stiff Areas: Apply lubricant directly to the tight link and work it free by hand.

Shifting Hesitation Between Gears

If shifting becomes sluggish or hesitant, it can stem from improper drivetrain alignment or chain contamination.

Solutions:

  • Check Cable Tension: Ensure that derailleur cable tension is appropriate. Modern Shimano drivetrains require fine-tuning the barrel adjuster.
  • Clean the Chain Thoroughly: Dirt and debris can cause slow shifting. Clean the chain and drivetrain to restore crisp gear changes.
  • Verify Chain Compatibility: The CN-HG701 must be paired with an 11-speed compatible cassette and chainrings to function correctly.

Chain Noise in the Lowest or Highest Gear

Audible rubbing in the lowest or highest gear often indicates poor derailleur adjustment or a bent hanger.

Solutions:

  • Inspect Derailleur Limits: Adjust the high and low limit screws to prevent the derailleur from pushing the chain too far.
  • Straighten the Hanger: Use a derailleur hanger alignment tool to ensure the hanger is properly aligned.

Misaligned Chain Pins

Improperly installed chain pins can protrude, creating a weak point that can lead to chain failure.

Solutions:

  • Check Pin Flushness: After installing a chain pin, verify it sits flush with the outer plate.
  • Replace if Necessary: If the pin is not properly seated, it’s safer to remove the link and replace it with a new one using a Quick-Link or fresh pin.

The CN-HG701 is an outstanding chain that delivers exceptional performance when installed and maintained correctly. By addressing these common issues early, you can ensure that your drivetrain remains efficient, quiet, and long-lasting.