When installing or maintaining your Shimano FC-6700 [paid link] chainring, one of the most critical aspects to ensure smooth performance and longevity is the proper tightening of the chainring bolts. Over-tightening or under-tightening the bolts can lead to a range of issues, from poor shifting performance to damage to the crankset or chainring. This guide will walk you through the correct procedures for tightening the chainring bolts on the Shimano FC-6700 [paid link], helping you avoid mistakes that could compromise your drivetrain.

Tools Required

• 5mm Allen wrench [paid link]
• Torque wrench [paid link] (for accurate tightening)
• Chainring bolt tool (optional, for removal)
• Loctite or anti-seize lubricant (optional)

Understanding the Importance of Proper Chainring Bolt Torque

The Shimano FC-6700 [paid link] chainring bolts hold the chainring in place, ensuring a secure connection between the crankset and the chainring. These bolts play a crucial role in the functionality of the drivetrain, as they need to maintain a consistent position to avoid movement or loosening during riding.

If the bolts are too loose, the chainring may shift or come loose, leading to inefficient power transfer, noise, and potential safety risks. Conversely, over-tightening the bolts can result in damaging the crankset or warping the chainring. The goal is to find the sweet spot with the correct torque specification to prevent these issues.

Shimano FC-6700 Chainring Bolt Torque Specifications

For the Shimano FC-6700, the manufacturer recommends tightening the chainring bolts to a specific torque value to ensure optimal performance and avoid damage. The recommended torque for the chainring bolts is 10–12Nm.

It’s crucial to use a torque wrench [paid link] when tightening these bolts to ensure that you stay within the recommended torque range. This not only prevents damage to the components but also helps you achieve the desired clamping force without risking either over-tightening or under-tightening.

Step-by-Step Guide to Tightening the Chainring Bolts

Follow these steps to properly tighten the Shimano FC-6700 chainring bolts:

1. Remove the Crankset (if necessary)
   Before you can access the chainring bolts, you may need to remove the crankset. If your Shimano FC-6700 crankset is still attached to the bike, use a crank arm removal tool to carefully remove the arms from the bottom bracket. Place the crankset on a workbench or stable surface.
2. Clean the Chainring and Crankset
   If you’re installing a new chainring or re-installing an existing one, it’s a good idea to clean both the chainring and crankset. Dirt or grime on the surfaces can cause uneven clamping pressure and lead to misalignment or slipping. Use a clean cloth or degreaser to remove any debris from the mounting surfaces.
3. Lubricate the Bolts (optional)
   For better bolt retention and to prevent seizing over time, apply a small amount of anti-seize lubricant or Loctite to the threads of the chainring bolts. This is especially useful if you live in an area with high humidity or frequently ride in wet conditions, as it can help prevent rust and corrosion.
4. Install the Chainring onto the Crankset
   Align the chainring onto the crankset, ensuring that the bolt holes match up with the mounting holes on the crankset. Ensure that the chainring is positioned in the desired orientation (usually with the logo or design facing outward).
5. Insert and Hand Tighten the Chainring Bolts
   Place the chainring bolts into the mounting holes and hand-tighten each bolt in a star pattern. This helps ensure that the chainring is centered and evenly positioned before applying the final torque.
6. Tighten the Bolts with a Torque Wrench [paid link]
   Using a 5mm Allen wrench [paid link], begin tightening the bolts in a star or criss-cross pattern. This pattern ensures that the pressure is distributed evenly across the chainring, preventing warping or bending. Once the bolts are snug, use a torque wrench to tighten them to the recommended torque of 10–12Nm. Be sure to check each bolt for consistency and make any adjustments if necessary.
7. Double-Check the Tightness
   After tightening the bolts, go over each one again with your torque wrench to verify that they are all securely tightened within the proper torque range. It’s better to double-check now than to deal with any issues later on during your ride.

Common Mistakes to Avoid

When tightening the Shimano FC-6700 chainring bolts, avoid the following common mistakes:

• Over-tightening: Using excessive force can damage the chainring, crankset, or even the bolts themselves. Always use a torque wrench to ensure that the bolts are tightened to the correct specification.
• Under-tightening: Failing to properly tighten the bolts can lead to shifting issues, chainring movement, or even bolts loosening during a ride, leading to potential accidents.
• Skipping the Star Pattern: Tightening the bolts in a star pattern ensures even pressure distribution across the chainring. Tightening them in a circular pattern can cause the chainring to warp or become misaligned.
• Neglecting Lubrication: Not lubricating the threads or using anti-seize can cause rust and corrosion, making it difficult to remove the bolts later on.

Additional Tips for Ensuring Proper Bolt Tightening

• Check Bolt Condition: Before tightening, inspect the chainring bolts for any signs of wear or damage. Replace any bolts that are stripped or damaged to avoid problems during tightening.
• Re-tighten After Riding: After the first ride following installation or reinstallation, check the chainring bolts again to ensure they remain tight. Bolts can sometimes settle or loosen slightly after initial use, so it’s a good idea to perform this check periodically.

By following these steps and tips, you can ensure that your Shimano FC-6700 chainring is securely installed and performing at its best. Properly tightened chainring bolts will help ensure a smooth, efficient ride and extend the lifespan of your drivetrain components.