The Shimano CN-HG93 [paid link] chain, renowned for its durability and performance, plays a pivotal role in the functionality of any 9-speed road drivetrain. However, even with its solid construction and Shimano’s engineering prowess, improper handling during installation, adjustment, or maintenance can cause significant drivetrain issues. This guide will walk you through common CN-HG93 [paid link] chain mistakes and provide clear guidance to ensure your bike performs flawlessly mile after mile.
Understanding the CN-HG93 Chain
The CN-HG93 [paid link] is part of Shimano’s Hyperglide series, designed for seamless shifting and dependable power transfer across a 9-speed system. Constructed with precision, it features chrome-plated pins and inner links for increased wear resistance, delivering excellent longevity when properly cared for. Yet, its performance heavily relies on accurate installation and diligent maintenance.
Incorrect Chain Length Sizing
Choosing the wrong chain length is one of the most frequent and damaging mistakes. If the chain is too short, the rear derailleur is overstressed, potentially leading to premature spring wear or even derailleur failure. Conversely, an overly long chain compromises shifting precision and increases the risk of chain drop.
Always size the CN-HG93 using the “big-big” method without threading through the rear derailleur: wrap the chain around the largest chainring and the largest rear cog, add two full links, and cut accordingly. Proper chain sizing ensures optimal derailleur tension and drivetrain efficiency.
Poor Chain Joining Technique
Joining the CN-HG93 chain incorrectly can severely weaken the link, making it prone to snapping under load. Shimano recommends using a dedicated connecting pin, not a reusable master link unless specified by the manufacturer. Pushing the pin improperly—such as inserting it at an angle or not fully seating it—can misalign the plates and compromise chain integrity.
Always use a high-quality chain tool designed for Shimano chains and follow precise alignment. Misaligned pins create stiff links, leading to erratic shifting and increased drivetrain wear.
Inadequate Lubrication
Neglecting regular lubrication is a shortcut to accelerated chain wear and poor shifting performance. The CN-HG93 chain requires consistent lubrication to minimize friction and protect against corrosion. Applying too little lube leaves the chain dry and noisy, while over-lubricating attracts dirt and grit, turning the chain into a grinding paste.
The best practice is to clean the chain thoroughly and apply a moderate amount of lubricant to each roller, then wipe off the excess. This method ensures smooth operation and extends the life of both the chain and cassette.
Cross-Chaining Neglect
Cross-chaining—riding in extreme gear combinations such as the big chainring and biggest rear cog, or small chainring and smallest cog—is damaging to the CN-HG93 chain and drivetrain. This position strains the chain at awkward angles, leading to excessive wear on the links and cogs.
To preserve drivetrain health, maintain a straighter chain line whenever possible. Riders should shift intelligently, using the full range of gears without forcing the chain into extreme angles.
Skipping Proper Installation Torque
Incorrect torque settings during drivetrain assembly can ruin a freshly installed CN-HG93 chain. Installing chainring bolts or cassette lockrings too loosely or too tightly causes misalignment and uneven load distribution, which degrades chain engagement.
Always use a torque wrench [paid link] and adhere to Shimano’s specified torque values for all drivetrain components. Correct torque ensures the chain meshes properly with the chainring and cassette teeth, promoting smooth shifts and prolonged drivetrain life.
Delayed Chain Replacement
Waiting too long to replace a worn CN-HG93 chain leads to cascading damage across the drivetrain. A stretched chain prematurely wears the cassette and chainrings, resulting in costly replacements.
Routinely check chain wear with a chain checker tool. Replace the CN-HG93 chain once it reaches 0.75% elongation for road bikes. Timely replacement saves money and maintains drivetrain efficiency.
Ignoring Compatibility Specifications
The CN-HG93 is engineered specifically for 9-speed systems. Using it on drivetrains with mismatched speed ratings or incompatible components can cause poor shifting, increased wear, and even drivetrain failure.
Ensure that the chain is paired with a 9-speed cassette, derailleur, and chainrings as designed. Mixing components outside Shimano’s recommendations compromises performance and reliability.
Improper Chain Cleaning Techniques
Using aggressive solvents or power washers can damage the CN-HG93’s surface treatments and force water into the chain’s internals, leading to corrosion. Likewise, abrasive brushes can scratch the plates, accelerating wear.
Instead, clean the chain with a gentle degreaser and a soft brush. Rinse with low-pressure water and thoroughly dry before lubrication. Proper cleaning maintains the integrity of the chain’s finish and internal lubrication.
Misunderstanding Break-In Behavior
New chains like the CN-HG93 often have a break-in period where they feel slightly stiff. Riders sometimes interpret this initial tightness as a defect, adjusting derailleurs or tension unnecessarily. Such premature adjustments can throw off optimal settings, causing more harm than good.
Allow a few rides for the chain to settle before making any drivetrain adjustments. Patience ensures that the system stabilizes naturally, providing smoother long-term performance.
Conclusion
The Shimano CN-HG93 chain is a highly capable component, but only if treated with respect to its design and maintenance needs. Avoiding these common mistakes—incorrect sizing, poor joining technique, insufficient lubrication, cross-chaining, skipping torque specifications, delaying replacement, mismatched compatibility, harsh cleaning methods, and misinterpreting break-in behavior—will ensure your drivetrain runs smoothly and lasts longer. With careful attention to detail, you can maximize the lifespan and performance of your CN-HG93 chain, keeping your rides fast, efficient, and trouble-free.