The Shimano CS-6700 [paid link] cassette is a key component of the Shimano Ultegra 10-speed drivetrain. Known for its lightweight design, excellent shifting performance, and durability, this cassette is a popular choice among road cyclists. Proper installation, adjustment, and maintenance are crucial for ensuring smooth gear changes and maximizing the cassette’s lifespan.

In this guide, we’ll cover everything you need to know about the CS-6700 [paid link], including step-by-step installation, fine-tuning for optimal performance, routine maintenance, and troubleshooting common issues.

Understanding the Shimano CS-6700 Cassette

The Shimano CS-6700 [paid link] is designed for 10-speed road bikes and features an optimized gear combination for efficient power transfer. It is compatible with Shimano Hyperglide (HG) freehub bodies and offers precise shifting performance when paired with a compatible chain and derailleur system.

Key Features of the CS-6700 Cassette

• 10-speed compatibility – Works with Shimano 10-speed road groupsets.
• Hyperglide (HG) technology – Ensures smooth and quick shifting.
• Lightweight design – Alloy spider construction reduces weight.
• Multiple gear ratios – Available in various configurations to suit different riding styles.

Tools Required for Installation and Maintenance

To install, adjust, and maintain your Shimano CS-6700 cassette, you’ll need the following tools:

• Cassette lockring tool [paid link] (Shimano TL-LR15 [paid link] or compatible)
• Chain whip tool [paid link]
• Adjustable wrench or socket wrench
• Torque wrench [paid link] (recommended)
• Cleaning brush and degreaser
• Lubricant (for maintenance)

How to Install the Shimano CS-6700 Cassette

Step 1: Preparing the Freehub Body

Before installing the CS-6700 cassette, ensure the freehub body is clean and free of debris. If necessary, wipe it down with a clean rag and apply a light layer of grease to prevent corrosion.

Step 2: Positioning the Cassette on the Freehub

1. Align the smallest cog with the corresponding notches on the freehub body.
2. Slide each cog onto the freehub, ensuring they fit snugly.
3. If your cassette comes with spacers, install them as indicated in the Shimano manual.

Step 3: Securing the Lockring

1. Thread the cassette lockring onto the freehub by hand to prevent cross-threading.
2. Use the cassette lockring tool [paid link] and a wrench to tighten the lockring securely.
3. Torque the lockring to 40Nm, as recommended by Shimano.

Adjusting the Cassette for Optimal Performance

Checking the Derailleur Alignment

After installing the CS-6700 cassette, check the derailleur hanger for alignment. A misaligned derailleur can cause poor shifting and uneven wear.

Fine-Tuning Indexing and Shifting

1. Shift through all gears to ensure smooth transitions.
2. If shifting feels sluggish, adjust the barrel adjuster on the rear derailleur.
3. For precise shifting, fine-tune the high and low limit screws on the derailleur.

Routine Maintenance for the Shimano CS-6700 Cassette

Proper maintenance extends the lifespan of your cassette and improves drivetrain efficiency.

Cleaning the Cassette

1. Remove the rear wheel and take off the cassette using the lockring tool [paid link].
2. Clean each cog using a degreaser and a brush.
3. Wipe dry and reassemble the cassette following the installation steps.

Lubricating the Drivetrain

• Apply chain lubricant sparingly to the chain, avoiding direct application to the cassette.
• Excess lubricant should be wiped off to prevent dirt buildup.

Troubleshooting Common Shimano CS-6700 Cassette Issues

Slipping Gears

• Ensure the cassette lockring is properly tightened.
• Check for chain wear; a worn chain can cause skipping.
• Verify derailleur alignment and cable tension.

Noisy Shifting

• Clean and lubricate the cassette and chain.
• Adjust derailleur limit screws and indexing.

Uneven Wear on Cogs

• Rotate the chain regularly to prevent premature cassette wear.
• Avoid cross-chaining, which can stress specific cogs.

Final Thoughts

The Shimano CS-6700 cassette is a high-performance component that requires careful installation and regular maintenance. By following the steps outlined in this guide, you can ensure smooth shifting, prevent premature wear, and keep your drivetrain running efficiently for thousands of miles.