The Shimano CN-5800[paid link] chain, part of the popular 105 11-speed groupset, is a reliable and well-engineered component. However, riders often report a “skippy” feeling under power or when shifting. This issue can undermine performance and lead to premature wear across your drivetrain. Addressing this behavior involves understanding the unique design of the CN-5800[paid link], how it interacts with other drivetrain elements, and precise setup practices.
Common Causes Behind a Skippy Shimano CN-5800 Chain
Skippiness typically arises when chain engagement is inconsistent or unstable. For the CN-5800, several drivetrain factors can be responsible. A worn cassette, incorrect chain length, poor derailleur alignment, or lack of chain lubrication can all contribute.
Because the CN-5800 chain is engineered for precise tolerances, even minor misalignments or incompatible components can result in rough performance. This is especially true if the chain is paired with a non-Shimano or mismatched 11-speed cassette, where ramp profiles and cog spacing may differ subtly.
Chain Wear and Cassette Compatibility
Even if the CN-5800 chain appears visually intact, elongation due to internal wear can cause it to ride unevenly on cassette teeth. This effect is magnified when paired with a partially worn cassette. Riders often attempt to reuse an old cassette with a new CN-5800 chain, only to encounter skipping under load.
It’s important to measure the chain using a wear checker tool. If elongation exceeds 0.5%, replacement is recommended. For optimal performance, replace both the chain and cassette simultaneously, especially if the cassette shows signs of shark-toothing or inconsistent cog profiles.
Chain Length and B-Tension Setup
The Shimano CN-5800 chain requires precise length calibration. Too short, and the derailleur cage is overly extended in larger gear combinations; too long, and chain wrap becomes inefficient, especially in smaller cog combinations. Both cases can result in inconsistent shifting or a skippy sensation during torque-heavy pedaling.
To ensure the correct length, follow Shimano’s method: wrap the chain around the largest front and rear cogs without the derailleur, then add two full links. Once installed, adjust the B-tension screw to ensure the upper jockey wheel maintains optimal clearance from the cassette. Improper B-tension leads to poor chain wrap and ghost shifts.
Chain Lubrication and Maintenance Habits
Poor lubrication is a silent but significant contributor to chain skippiness. A dry CN-5800 chain may initially appear functional, but under power, metal-on-metal contact increases resistance and causes it to slip over the cassette teeth. Over-lubing, on the other hand, attracts grime that interferes with engagement.
Use a high-quality lubricant specific to riding conditions, and apply it sparingly to the inner rollers. Wipe off excess to prevent dirt buildup. Establish a maintenance routine every 150-200 km in dry weather or after every wet ride.
Fixing Misalignment in the Rear Derailleur
Rear derailleur alignment is another critical aspect. The CN-5800 performs best when the derailleur hanger is perfectly straight and the indexing is calibrated accurately. A misaligned hanger or incorrect cable tension can prevent the chain from fully engaging with the target cog, leading to inconsistent power transfer.
Using a derailleur hanger alignment tool can identify and correct deviations. Pair this with fine-tuning of the barrel adjuster to ensure each shift results in clean and accurate engagement.
When Chainrings Contribute to Skipping
Although less common, worn or incompatible front chainrings can also trigger skippy behavior, especially when pedaling under load in the small ring. The CN-5800 chain is optimized for Shimano 11-speed chainring profiles. Using aftermarket rings with different tooth shaping can compromise engagement.
Inspect the chainring teeth for wear and ensure their profiles match Shimano’s ramp design. If not, consider upgrading to a 5800-series crankset for better overall drivetrain harmony.
Immediate Performance Improvements
To quickly improve performance and eliminate the skippy feel:
- Verify and correct chain length using Shimano’s guidelines.
- Replace both chain and cassette if wear is evident.
- Ensure derailleur hanger alignment is accurate.
- Fine-tune rear indexing using the barrel adjuster.
- Clean and lubricate the CN-5800 chain properly.
By methodically checking each factor and prioritizing compatibility, the Shimano CN-5800 can deliver its signature smooth and responsive feel, even under heavy loads.
Conclusion
A skippy Shimano CN-5800 chain is often a symptom of broader drivetrain imbalance. Whether it stems from wear, poor setup, or incompatible parts, the solution lies in understanding and honoring Shimano’s engineering tolerances. With careful inspection, setup, and maintenance, riders can restore—and maintain—the silky-smooth performance that the CN-5800 was designed to deliver.
Frequently Asked Questions (FAQs)
1. Can a Shimano CN-5800 chain skip due to a bent derailleur hanger? Yes, a misaligned derailleur hanger can prevent proper gear indexing, causing the chain to skip.
2. Should I replace my cassette when I replace the CN-5800 chain? If the cassette shows signs of wear or if skipping persists after a new chain installation, it is recommended to replace both components.
3. Is the CN-5800 compatible with other 11-speed drivetrains? While it works best with Shimano 11-speed systems, cross-brand compatibility can lead to suboptimal performance and skipping.
4. How often should I lubricate the CN-5800 chain? Every 150-200 km under dry conditions or after any wet ride, depending on riding conditions.
5. What is the correct chain length for a CN-5800? Wrap the chain around the largest front and rear cogs (bypassing the derailleur) and add two full links for the proper length.