How to Replace the Shimano CN-6701 Chain for Better Performance and Longevity

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Replacing your Shimano CN-6701[paid link] chain is a crucial part of maintaining an efficient, smooth, and long-lasting drivetrain. As a key component in Shimano’s 10-speed road groupsets, the CN-6701[paid link] chain features asymmetrical plates designed for optimal front and rear shifting performance. Over time, chains wear out due to mileage, contamination, and improper maintenance, leading to poor shifting and accelerated wear on cassettes and chainrings. This guide outlines the technical process for properly replacing your CN-6701 chain, including key considerations for compatibility, installation accuracy, and performance optimization.

When to Replace the Shimano CN-6701 Chain

The first step in maintaining drivetrain performance is recognizing when the chain needs replacement. Chain wear is typically measured using a chain checker tool. When elongation reaches 0.75% to 1.0%, it’s time to replace the chain to avoid further component damage. For the CN-6701, replacement is recommended every 2,000 to 3,000 miles depending on riding conditions and maintenance.

Signs that indicate chain replacement:

  • Shifting delays or chain skipping under load
  • Chain slippage on rear cogs despite correct derailleur indexing
  • Measured elongation with a chain wear tool within replacement range
  • Audible drivetrain noise even after cleaning and lubrication

Tools Required

  • Chain wear indicator tool
  • Shimano-approved chain tool (TL-CN28 or compatible)
  • Shimano Quick-Link or replacement connecting pin (specific to CN-6701)
  • Chain whip and cassette lockring tool[paid link] (if cassette inspection is needed)
  • Torque wrench[paid link] (optional but recommended for drivetrain reassembly)
  • Degreaser and clean rags
  • Bike stand[paid link] (for stability during installation)

Removing the Old CN-6701 Chain

Begin by shifting the chain onto the smallest chainring and smallest rear cog. This positioning relieves tension in the drivetrain, making removal easier. If your chain uses a Quick-Link, use master link pliers to disconnect it. If connected via a Shimano pin, use a chain breaker tool to push out a rivet.

Inspect the chain for stiff links or abnormal wear patterns. Note whether the chain length was previously correct, as this will inform your new installation. Dispose of the old chain responsibly.

Sizing and Preparing the New CN-6701 Chain

The Shimano CN-6701 is a directional chain, which means installation orientation is critical. The outer plates with the Shimano logo should face outward from the bike. Before installing, lay the new chain alongside the old one (if the length was correct) or use Shimano’s method for calculating chain length. Wrap the chain around the largest chainring and the largest cog without threading through the derailleur, then add one full inner-outer link pair.

If cutting the chain is necessary, always use a Shimano-compatible chain tool to avoid damaging link pins. Ensure clean, square cuts for optimal connection.

Installing the New Chain

With the chain routed correctly through the derailleur pulleys and drivetrain, connect the ends using the appropriate method:

  • Connecting pin: Insert the Shimano-specific pin using the chain tool. After insertion, snap off the guide pin and check for smooth articulation.
  • Quick-Link: Insert the link and apply tension by pedaling forward while holding the rear brake to snap it into place.

Double-check that the chain moves freely and smoothly through the full gear range. Ensure there are no stiff links or kinks that could compromise performance.

Post-Installation Inspection and Lubrication

After installation, rotate the crankset and shift through all gears to confirm proper function. Check for hesitation, skipping, or noise. If any issues arise, recheck derailleur adjustment and chain alignment.

Apply high-quality chain lubricant, wipe off excess, and allow it to penetrate before your next ride. Proper lubrication reduces friction, prevents rust, and prolongs component life.

Longevity Tips for the CN-6701 Chain

  • Clean and lubricate the chain every 100–200 miles in dry conditions, more frequently in wet or dirty environments.
  • Avoid cross-chaining to reduce stress and premature wear.
  • Check chain stretch monthly using a wear tool.
  • Replace chainrings and cassette when wear becomes pronounced to maintain shifting performance.

By adhering to these guidelines, your new Shimano CN-6701 chain will deliver crisp, quiet, and efficient performance while extending the life of the entire drivetrain.

Frequently Asked Questions (FAQs)

Q1: Can I reuse a Shimano connecting pin on the CN-6701?
No, Shimano connecting pins are designed for single use only. Reuse compromises chain safety and function.

Q2: Is a Quick-Link compatible with the CN-6701 chain?
Yes, but it must be a 10-speed compatible Quick-Link approved by Shimano.

Q3: What happens if I install the CN-6701 chain backwards?
As a directional chain, incorrect orientation may impair shifting quality, especially in front shifts.

Q4: How do I know if I cut the chain too short?
If the rear derailleur is overstretched on the largest gear combinations, the chain is too short and must be replaced.

Q5: Can I mix the CN-6701 with a non-Shimano cassette or chainring?
While possible, optimal performance is achieved when the chain is used with Shimano 10-speed components designed for it.