Replacing your Shimano CN-HG701 [paid link] chain is a crucial maintenance task that can significantly extend the life of your drivetrain and ensure optimal performance. This guide provides a step-by-step approach to correctly replacing the CN-HG701 [paid link] chain, with detailed insights into ensuring longevity and minimizing wear on related components.
Tools Required
- Chain tool (compatible with 11-speed chains)
- Quick-link pliers (optional, if using quick-links)
- Shimano-approved replacement CN-HG701 [paid link] chain
- Chain wear checker
- Chain lubricant (wet or dry based on riding conditions)
- Clean cloth and degreaser
Understanding When to Replace the CN-HG701 Chain
The CN-HG701 chain, part of Shimano’s premium 11-speed lineup, is engineered for smooth, reliable shifting and long-lasting performance. However, even the best chains experience wear over time. It’s essential to replace the chain before it stretches beyond recommended tolerances (typically 0.5% to 0.75% elongation).
Using a chain wear checker periodically will help monitor the wear. If the gauge drops into the links without force at the 0.5% mark, it’s time to prepare for a replacement. Continuing to ride on an overstretched chain risks damaging the cassette and chainrings, which are far more costly to replace.
Preparation Before Replacement
Before starting the chain replacement process, thoroughly clean the drivetrain to remove accumulated grime and ensure an accurate assessment of wear on the cassette and chainrings. Inspect the teeth for signs of wear such as shark fin-shaped profiles or burrs. Excessive wear on the drivetrain may warrant replacing the cassette along with the chain to maintain optimal shifting performance.
Ensure you have the correct length CN-HG701 chain. It is designed specifically for 11-speed road and MTB drivetrains and includes Shimano’s SIL-TEC treatment for reduced friction and increased durability.
Steps to Remove the Old Chain
- Position the Bike Securely: Place the bike on a stand to allow free rotation of the cranks and wheels.
- Locate the Master Link or Chain Pin: The CN-HG701 may be joined using either a Shimano connecting pin or a third-party quick link.
- Break the Chain:
- If using a quick link, compress the link with pliers and disengage it.
- If using a chain pin, align a chain tool on the specific pin and drive it out carefully to release the chain.
- Remove the Chain: Pull the chain away from the drivetrain, ensuring it doesn’t snag on derailleur pulleys or chainrings.
Dispose of the worn chain responsibly; used chains are typically not recyclable through standard metal recycling.
Sizing the New CN-HG701 Chain
Chain sizing is critical to ensuring precise shifting and drivetrain efficiency. The correct length is determined by wrapping the new chain around the largest chainring and the largest rear cog (without routing through the rear derailleur) and adding two full links (one inner and one outer link).
For bikes with a rear suspension or unusual drivetrain setups, refer to Shimano’s specific chain sizing guidelines to accommodate chain growth or slack.
Once sized, use the chain tool to remove excess links cleanly, ensuring the ends are correctly prepped for connection.
Installing the New CN-HG701 Chain
- Thread the Chain: Guide the chain through the front derailleur, around the chainrings, through the rear derailleur’s jockey wheels following the correct path, and around the cassette.
- Connect the Chain:
- If using a Shimano connecting pin, insert the special pin provided with the chain and use a chain tool to press it in until it seats correctly. Snap off the pilot portion of the pin.
- If using a quick link (Shimano’s or a compatible one), align both ends of the chain, insert the quick link, and apply tension by turning the cranks under load to snap the link into place.
Double-check that the chain runs smoothly through the drivetrain without kinks or binding.
Lubricating the New Chain
Proper lubrication is essential immediately after installation. Wipe the chain to remove any factory-applied grease, which can attract dirt. Apply a thin stream of chain lubricant to each roller while slowly pedaling backward. Let the lubricant penetrate for a few minutes, then wipe off the excess to prevent attracting debris.
Choosing the correct lubricant—wet for damp, muddy conditions or dry for dusty, dry environments—will optimize chain life and drivetrain cleanliness.
Post-Installation Checks
After installing and lubricating the CN-HG701 chain:
- Shift through all gears to ensure smooth, quiet operation.
- Confirm there is no skipping or sluggish shifting, which could indicate improper chain length or installation.
- Recheck the quick link or pin for proper seating and security.
A correctly installed CN-HG701 chain should shift crisply and operate quietly. Regular maintenance, including cleaning and re-lubricating every 100-200 miles depending on conditions, will ensure it delivers long service life.
Troubleshooting Common Replacement Issues
Skipping Gears:
If the new chain skips under load, inspect for worn cassette teeth or improper chain length. Severe cassette wear typically requires replacing the cassette alongside the chain.
Poor Shifting:
Ensure the rear derailleur hanger is straight. Misalignment can cause poor shifting even with a new chain.
Chain Squeak or Noise:
Insufficient lubrication or contamination can cause squeaking. Reapply a suitable chain lube and clean the drivetrain thoroughly.
Conclusion
Replacing your Shimano CN-HG701 chain is a straightforward process that plays a vital role in preserving drivetrain integrity and performance. By following these precise steps—careful removal, correct sizing, proper installation, and thorough lubrication—you ensure smoother rides and extend the lifespan of your entire drivetrain. Regular inspections and timely replacements are essential to avoid costly repairs and maintain a flawless cycling experience.