The Shimano CN-6701 [paid link] chain, part of the Ultegra 10-speed road groupset, is a high-performance component engineered for smooth, reliable shifting under varying load conditions. Proper upkeep not only ensures consistent operation but also extends the life of both the chain and drivetrain. This comprehensive guide outlines essential maintenance practices, performance optimization tips, and advanced care strategies tailored to the CN-6701 [paid link].
Understanding the CN-6701’s Technical Specifications
The CN-6701 [paid link] chain features asymmetric outer plates designed for improved shifting efficiency and reduced drivetrain noise. With a directional design, installation orientation plays a crucial role in performance. Constructed from durable steel with a chromized pin treatment, this chain is intended for serious cyclists who demand precision and reliability.
The Role of Routine Cleaning in Chain Performance
Chain cleanliness is a critical factor in maintaining efficient power transfer. Accumulated grime can cause stiff links, noisy operation, and accelerated wear. For the CN-6701, which is engineered for tight tolerances, regular cleaning ensures that shifting remains crisp and the chain’s intended geometry is preserved.
Use a degreaser compatible with metal finishes and avoid high-pressure water, which may force contaminants into the chain’s inner rollers. After cleaning, fully dry the chain before applying lubricant to prevent corrosion.
Choosing the Right Lubrication Strategy
Lubrication serves a dual purpose: reducing friction and protecting the metal surfaces from moisture and contaminants. For the Shimano CN-6701, a medium-viscosity wet lube [paid link] is recommended for wet or mixed conditions, while a dry lube [paid link] may be preferred in arid environments to minimize dirt attraction.
Apply lubricant only to the rollers and inner links, wiping away any excess to prevent debris accumulation. This targeted approach ensures lubrication reaches the wear-critical surfaces without creating buildup.
Optimizing Chain Tension and Length
An improperly tensioned or over-stretched chain can severely impair performance. The CN-6701 must be installed with precise length, ensuring that in the small-small gear combination, the chain is not slack, and in the large-large, the derailleur is not overstretched.
Use the standard method of wrapping the chain around the largest front and rear cogs (without derailleur involvement) and adding two full links to establish ideal length. This practice ensures compatibility with the drivetrain’s capacity while promoting smoother shifts.
Monitoring Chain Wear for Timely Replacement
A worn chain not only degrades its own performance but also damages cassettes and chainrings. For the CN-6701, using a chain wear indicator tool is essential to detect elongation beyond the 0.75% threshold. Shimano recommends replacement before reaching 1.0% elongation to preserve drivetrain integrity.
Regular inspection intervals should coincide with other maintenance routines, ideally every 500–800 km depending on terrain, rider weight, and environmental conditions.
Advanced Cleaning Techniques for Heavy Use
Cyclists who ride in adverse conditions or train daily must occasionally deep clean the CN-6701. This involves removing the chain (using a Shimano-specific quick link or pin extractor) and soaking it in a solvent bath, followed by ultrasonic cleaning if available.
Once dry, the chain should be reinstalled following its directional markings. Always lubricate immediately after reinstalling to avoid metal-on-metal contact during the first rotations.
Preventing Corrosion and Metal Fatigue
The CN-6701’s chromized pin surface resists rust, but improper storage or cleaning can still allow moisture intrusion. Store the bike in a dry environment and avoid prolonged exposure to road salt or chemicals.
After wet rides, thoroughly wipe down the drivetrain and re-lubricate as necessary. A corrosion-inhibited lubricant can provide an additional layer of protection for those in coastal or humid environments.
Conclusion: Maintaining Peak Performance
With the right attention to cleaning, lubrication, and wear management, the Shimano CN-6701 chain can deliver thousands of kilometers of reliable performance. Its directional design and premium construction require precision and diligence, but the reward is a drivetrain that remains efficient, quiet, and responsive.
FAQs
Q1: How often should I lubricate the CN-6701 chain?
A1: Every 150–250 km in dry conditions or immediately after wet rides. Frequency may vary based on terrain and riding style.
Q2: Can I use a quick link with the CN-6701 chain?
A2: Yes, but Shimano recommends using their proprietary 10-speed quick link or replacement pins for optimal fit and safety.
Q3: What signs indicate the CN-6701 chain needs replacing?
A3: Increased drivetrain noise, poor shifting accuracy, and measurable elongation beyond 0.75% using a chain checker.
Q4: Does the chain’s directional design really affect performance?
A4: Absolutely. Installing the CN-6701 in reverse can result in noisy operation and inconsistent shifting.
Q5: Is ultrasonic cleaning safe for the CN-6701 chain?
A5: Yes, when done properly. Ensure the chain is thoroughly rinsed and dried before re-lubrication to avoid internal rusting.