The Shimano CN-HG71 [paid link] chain is a popular choice among road cyclists and mountain bikers alike, known for its reliability, smooth shifting, and durability. However, even the best chain can lead to serious drivetrain problems if not handled correctly. This guide explores the most common mistakes riders make when installing, maintaining, and using the CN-HG71 [paid link] chain, and how to avoid them to protect your drivetrain investment.
Incorrect Chain Length
One of the first and most critical mistakes is installing the chain at the wrong length. The CN-HG71 [paid link] chain requires precise measurement to ensure optimal performance. If the chain is too long, shifting will be sluggish and the derailleur may not maintain proper tension, increasing the risk of chain drops. A chain that’s too short can overstress the derailleur and limit gear range.
To avoid this, use the big-big method without passing through the rear derailleur. Thread the chain around the largest chainring and largest cog, pull it tight, and add two full links (one inner and one outer link) to determine the correct length.
Skipping Chain Lubrication
The CN-HG71 is factory-lubricated, but over time, the lubricant wears off. Neglecting to relubricate leads to increased friction, accelerated wear, and noisy shifting. Many cyclists either over-lubricate, causing dirt buildup, or under-lubricate, causing premature chain and cassette wear.
Apply a high-quality lubricant specifically designed for bike chains. Wipe off the excess after application to prevent grime accumulation. Regular lubrication every 150-200 miles under dry conditions—or more frequently in wet, muddy environments—keeps the CN-HG71 operating smoothly.
Improper Joining Technique
Joining the CN-HG71 chain incorrectly can weaken it. Shimano recommends using a dedicated connecting pin or a compatible quick link. Improvising with non-compatible pins or reusing old pins compromises the chain’s strength, leading to potential failure under load.
Use a Shimano-approved connecting pin, carefully pressed in with a chain tool, and ensure the pin is flush on both sides. If using a quick link, verify its compatibility with the HG71 chain and make sure it is fully snapped into place before riding.
Mixing Incompatible Components
While the CN-HG71 is compatible with 6, 7, and 8-speed drivetrains, mismatching it with 9-speed or higher drivetrains leads to poor shifting and excessive wear. The chain’s width is engineered specifically for the spacing of 8-speed cassette sprockets. Attempting to force compatibility results in improper engagement with the cassette and chainrings.
Always pair the CN-HG71 with components designed for its speed specification to maintain the integrity of your drivetrain system.
Neglecting Chain Stretch Monitoring
Chains elongate over time, a phenomenon commonly referred to as “stretch,” although it’s actually wear at the pins and rollers. Riding with an excessively worn CN-HG71 damages the cassette and chainrings, leading to costly replacements.
Regularly check the chain for wear using a chain checker tool. Shimano recommends replacing the chain when wear exceeds 0.75% elongation to prevent cassette damage. Routine monitoring extends the life of your drivetrain components and ensures crisp shifting.
Incorrect Chainline
Installing the CN-HG71 on a bike with an improper chainline can cause excessive wear and shifting issues. A misaligned chainline forces the chain to operate at awkward angles, especially in extreme gear combinations.
Ensure your bottom bracket and crankset provide the correct chainline as specified by Shimano for your bike type. This reduces friction, enhances drivetrain efficiency, and prolongs component lifespan.
Forgetting Break-In Maintenance
Many riders ignore maintenance after the initial few rides. The CN-HG71 chain undergoes a break-in period where initial wear patterns form. Neglecting to clean and relubricate after the first 100 miles can allow grit and metal filings to accelerate wear.
After the break-in period, clean the chain thoroughly and apply fresh lubricant to remove contaminants and condition the chain for long-term use.
Cross-Chaining Habits
Cross-chaining—riding on extreme gear combinations like big chainring to big cog or small chainring to small cog—puts lateral stress on the CN-HG71, increasing friction and wear. It also leads to poor shifting and noise.
Practice efficient gear selection by avoiding extreme cross-chain positions. Shift to the middle of the cassette when using the big or small chainring to keep the chainline as straight as possible.
Improper Storage Conditions
Leaving your bike outdoors or in damp conditions without proper protection can cause the CN-HG71 to rust. Moisture and debris cause the chain to seize and erode, diminishing performance and lifespan.
Store your bike in a dry, sheltered area. After rides in wet conditions, wipe down and dry the chain thoroughly to prevent rust formation.
Ignoring Manufacturer Specifications
Some riders ignore Shimano’s specific installation and maintenance recommendations, believing that general practices will suffice. However, following Shimano’s guidelines ensures that the CN-HG71 performs to its design standards.
Always refer to Shimano’s official technical documentation for installation torque values, pin types, and compatibility charts. Following the manufacturer’s specifications preserves your drivetrain’s health and optimizes riding performance.
Conclusion
The Shimano CN-HG71 chain is a robust, reliable choice for 6- to 8-speed drivetrains, but its longevity and performance hinge on correct handling. Avoiding the mistakes outlined above ensures your chain remains smooth, quiet, and efficient while protecting your entire drivetrain from unnecessary wear. Proper care, attention to detail, and adherence to best practices allow you to get the maximum life and performance from your CN-HG71 chain.