Replacing your Campagnolo Chorus 11s [paid link] (updated design) cassette is one of the most effective ways to maintain crisp, accurate shifting and consistent drivetrain performance. As cogs wear over time, they begin to cause chain slippage, gear skipping, and inefficient power transfer—issues that degrade the riding experience and can accelerate wear on other drivetrain components. This article provides a comprehensive, step-by-step guide to correctly replace the Chorus 11s [paid link] cassette, ensure compatibility, and fine-tune the system for optimal performance.
Tools Required
To perform this job efficiently and safely, gather the following tools:
- Cassette lockring tool [paid link] (Campagnolo-compatible)
- Chain whip
- Torque wrench [paid link] with compatible sockets
- 10mm hex key (for thru-axle removal if applicable)
- Bike stand [paid link] (optional but helpful)
- Degreaser and clean rag
- Grease (for freehub body preparation)
Understanding the Chorus 11s Updated Design
The updated Campagnolo Chorus 11-speed cassette incorporates revised spacing and refined cog design to improve shifting precision and durability. Notably, it uses the same spline pattern and overall architecture as Record and Super Record, but offers a more affordable steel/titanium cog blend depending on the configuration. This design provides compatibility with standard Campagnolo 11-speed freehub bodies and ensures interchangeability across the brand’s 11-speed lineup.
This model is available in multiple ratios, including popular configurations such as 11-25, 11-27, and 12-29, which influence how it performs under climbing and sprinting conditions.
When to Replace Your Chorus 11s Cassette
Signs that your cassette needs replacing include:
- Chain skips under load, especially in high torque situations.
- You notice uneven cog wear or visible shark-fin shapes on teeth.
- Shifting becomes inconsistent even with a new chain.
- Increased drivetrain noise, especially under load.
- You’ve already replaced the chain twice on the same cassette.
It’s critical to replace both the chain and cassette in tandem if wear is extensive. A worn cassette can damage a new chain rapidly, leading to premature component degradation.
Removing the Old Cassette
Begin by securing your bike in a stand or flipping it upside down on a soft surface. Shift the chain to the smallest cog to reduce tension.
- Remove the Rear Wheel: Use a quick release or thru-axle tool, depending on your setup.
- Engage the Chain Whip: Wrap the chain whip around one of the middle cogs to hold the cassette in place.
- Insert the Lockring Tool [paid link]: Fit the Campagnolo-compatible cassette lockring tool [paid link] into the lockring.
- Loosen the Lockring: Turn counterclockwise while holding the chain whip firmly. Once loosened, unscrew the lockring completely.
- Slide Off the Cogs: Carefully remove the cassette stack, noting the order and presence of any spacers.
Inspect the freehub body for notching or corrosion. Clean it thoroughly using a degreaser and a clean rag. Apply a thin coat of grease before reinstallation to prevent galling and noise.
Installing the New Chorus 11s Cassette
Correct installation ensures optimal gear indexing and longevity.
- Align the Splines: Campagnolo cassettes have one narrow spline that lines up uniquely with the freehub. Match this before sliding the cogs on.
- Stack in Order: Ensure each cog and integrated carrier is installed in correct sequence. Some cogs are grouped on carriers, simplifying this process.
- Check for Spacers: Confirm the presence and placement of any required spacers based on your specific gear ratio configuration.
- Install Lockring: Thread the lockring by hand, then use the torque wrench [paid link] and lockring tool [paid link] to tighten it to 40Nm as specified by Campagnolo.
- Reinstall Wheel: Mount the rear wheel back into the dropouts and secure it properly. Ensure the axle is seated evenly before tightening.
Post-Installation Adjustments
After installation, shifting may still require minor indexing adjustments.
- Adjust the Rear Derailleur: Use the barrel adjuster to fine-tune indexing. Test all gears under load.
- Inspect B-limit Screw: Ensure the derailleur clears the largest cog without rubbing.
- Verify Chain Length: If you’ve changed gear range (e.g., from 11-25 to 12-29), a longer chain may be required.
Test ride the bike and listen for clicking or lag when shifting. These signs indicate the need for additional adjustment.
Optimizing Performance with the New Cassette
To get the best results from your new Chorus 11s [paid link] cassette:
- Use a compatible, fresh 11-speed Campagnolo chain.
- Keep the drivetrain clean and lubricated with a chain lube suited to your riding environment.
- Avoid cross-chaining and gear combinations that induce high chain angles, especially under load.
Check drivetrain wear regularly and replace components in sync to avoid premature wear.
Compatibility Notes
The Chorus 11s (updated design) cassette is compatible with:
- All Campagnolo 11-speed shifters and derailleurs (Chorus, Record, Super Record, Potenza).
- Campagnolo 11-speed freehub bodies.
- Campagnolo 11-speed chains (Ultra-Link recommended).
It is not compatible with Shimano or SRAM 11-speed systems due to differing cog spacing and freehub spline profiles.
Conclusion
Replacing your Campagnolo Chorus 11s (updated design) cassette is a fundamental maintenance task that significantly enhances your bike’s shifting performance and longevity. By following the correct removal and installation procedures, ensuring compatibility, and performing proper post-installation adjustments, you ensure a smooth, quiet, and efficient ride. This upgrade, when done right, transforms not just your gear changes but your entire cycling experience.