The Shimano CN-HG93 [paid link] chain is a highly respected component, commonly chosen for its precision and reliability in 9-speed drivetrain systems. However, even premium chains like the CN-HG93 [paid link] require careful handling during installation and adjustment. Mistakes made during setup can drastically shorten the lifespan of both the chain and the drivetrain. This guide will walk you through the most common installation mistakes that can ruin your drivetrain and explain how to avoid them.
Tools Required
- Chain tool (compatible with 9-speed chains)
- Quick link or Shimano-approved connecting pin
- Chain wear indicator gauge
- Torque wrench [paid link] (if adjusting chainring bolts or cassette lockrings)
- Degreaser and chain lubricant
- Gloves
- Ruler or chain checker for measuring chain length
Understanding the CN-HG93 Chain Specifications
The Shimano CN-HG93 [paid link] is engineered with Hyperglide (HG) technology, offering smoother and more precise shifting for 9-speed systems. The chain has a 116-link configuration and features inner and outer plate designs to optimize contact with cassette sprockets and chainrings. This model is compatible with both road and mountain bike 9-speed drivetrains.
Being aware of these specifics is critical because an improper installation that ignores these engineered attributes can degrade performance and cause premature wear on expensive drivetrain components.
Common Installation Mistakes to Avoid
Incorrect Chain Length
One of the most frequent errors is installing a chain that’s either too long or too short. A chain that’s too long will cause slack, leading to poor shifting performance and chain drops. A chain that’s too short will restrict rear suspension movement (for MTB setups) or make it impossible to shift into larger sprockets.
Solution: Use the largest chainring and largest sprocket method—without routing through the derailleur—and add two full links to determine the correct length. Always double-check with a chain checker tool or ruler for precision.
Using the Wrong Connecting Method
The CN-HG93 chain requires a Shimano-specific connecting pin or an approved quick link. Using an improper pin can compromise chain strength, leading to catastrophic failures during rides.
Solution: Always use Shimano’s silver connecting pins for 9-speed chains or an officially approved 9-speed quick link. Never reuse old pins or mix components from different brands without compatibility confirmation.
Skipping Initial Cleaning
Out of the box, the CN-HG93 chain is coated with a factory lubricant that’s ideal for initial break-in but not optimal for long-term riding conditions. Installing the chain without cleaning off the packaging lubricant can lead to excessive grit accumulation and uneven wear.
Solution: Degrease the chain thoroughly before installation and apply a high-quality, condition-appropriate lubricant. Wipe off any excess lube after application to prevent dirt attraction.
Incorrect Chain Routing
Misrouting the chain through the derailleur pulleys is a classic mistake. Routing incorrectly affects the chain’s tension and leads to poor shifting and increased wear on jockey wheels.
Solution: Ensure the chain is routed properly through the rear derailleur, passing through both pulley wheels in the correct orientation. Pay special attention to any guides or markings on the derailleur cage that indicate the proper path.
Ignoring Proper Tension Settings
Failing to check and adjust chain tension can result in noisy, imprecise shifting and can wear down cassette sprockets prematurely.
Solution: After installation, check the chain tension by shifting across all gears. Proper tension should allow smooth movement without excessive slack. Fine-tune using the rear derailleur B-tension screw if necessary.
Post-Installation Checks
After installing the CN-HG93 chain, perform a thorough inspection:
- Shift through all gears to ensure smooth transitions.
- Inspect for any stiff links, especially around the connecting pin.
- Reapply lubricant after the first few rides to accommodate chain bedding-in.
- Check for abnormal noise or resistance, which could indicate an installation error.
Perform these checks meticulously to maximize the chain’s lifespan and protect the rest of your drivetrain from unnecessary wear.
Long-Term Maintenance to Prevent Premature Wear
Even if installed perfectly, improper maintenance can undo all the effort. Clean and lubricate your CN-HG93 chain regularly, ideally every 100-150 miles, depending on riding conditions. Use a chain checker to monitor for stretch; replacing the chain at 0.75% wear can save your cassette and chainrings from early replacement.
Final Thoughts
The Shimano CN-HG93 is a robust, high-performance chain when installed and maintained correctly. Avoiding common installation mistakes like improper chain length, incorrect connection methods, skipping initial cleaning, misrouting, and neglecting chain tension will ensure your drivetrain stays in optimal condition for thousands of miles. Proper care of your CN-HG93 chain guarantees not only peak performance but also cost savings by extending the life of your entire drivetrain.