When riding your bike, the last thing you want to hear is a persistent creak or noise coming from your crankset. These noises are not only annoying, but they can also indicate that something isn’t quite right with your Shimano FC-6700 [paid link] crankset. Understanding how to diagnose and resolve these noises is crucial for maintaining your crankset’s optimal performance and longevity. In this article, we’ll walk you through the steps to diagnose and fix common issues that cause creaks or other noises in your Shimano FC-6700 [paid link] crankset.

Common Causes of Noisy or Creaky Shimano FC-6700 Cranksets

Noises emanating from your Shimano FC-6700 [paid link] crankset could stem from several potential sources. The most common reasons include:

• Loose Crank Arm Bolts: A loose crank arm bolt can lead to a clicking or creaking sound during pedal strokes.
• Pedal Issues: If your pedals are not installed correctly or are worn out, they can produce creaky noises.
• Bottom Bracket Problems: A bottom bracket that is not properly installed or is worn down may be the source of noise, especially if the bearings are damaged.
• Chainring and Chain Issues: Worn chainrings or a poorly lubed chain can contribute to noise during cycling.
• Pedal Thread and Crank Arm Interaction: Poor engagement between the pedal threads and crank arm can cause creaks when pedaling.

Diagnosing the Noise Source

Before you attempt to fix the problem, it’s essential to diagnose where the noise is coming from. Here’s how to do it:

1. Inspect the Crank Arm Bolts:
   • Start by checking the tightness of the crank arm bolts. Use a torque wrench [paid link] to tighten them to the manufacturer’s recommended torque settings (generally around 40-50Nm for the Shimano FC-6700).
   • If these bolts are too loose, they can cause a creaking sound when pedaling. Ensure they are properly torqued and re-test the bike for noise.
2. Check the Pedals:
   • Remove your pedals and inspect the threads. Pedals with worn threads can cause them to sit loosely in the crank arms, leading to creaking.
   • Clean the pedal threads and re-lubricate them before reinstallation to ensure a tight and secure fit.
3. Inspect the Bottom Bracket:
   • A common source of noise is the bottom bracket. Ensure that the Shimano FC-6700 crankset’s bottom bracket is installed correctly, with no signs of wear or damage.
   • If the bottom bracket is loose, it can cause vibrations that create noise. Tighten it to the recommended torque specifications and check for any unwanted movement.
   • If the bottom bracket bearings feel rough when rotated by hand, it may need replacing.
4. Examine the Chainring and Chain:
   • Look closely at the chainring for signs of wear, such as teeth that are worn down, bent, or damaged. A damaged chainring can create a creaking sound when the chain engages the teeth.
   • Also, inspect your chain for wear. A worn chain can cause additional strain on the drivetrain, leading to noise. Ensure your chain is properly lubricated and cleaned.
5. Look for Pedal and Crank Arm Interaction Issues:
   • Check the pedal thread area on the crank arms to ensure that no debris is lodged in the threads. Clean the crank arm and pedal threads thoroughly before reinstalling.
   • Verify that the pedals are tightened correctly according to manufacturer specifications (typically 35-40Nm). Over-tightening or under-tightening can lead to creaks.

Fixing the Noisy or Creaky Shimano FC-6700 Crankset

Once you’ve identified the source of the noise, it’s time to fix the issue. Below are the necessary fixes based on the problems outlined above.

Tighten Crank Arm Bolts

• Step 1: Use a torque wrench [paid link] to tighten the crank arm bolts to the correct torque setting. Shimano recommends 40-50Nm of torque for the FC-6700 crankset.
• Step 2: Recheck the crank arms for any looseness or movement after tightening.
• Step 3: Test ride the bike to see if the noise is resolved.

Fix Pedal Issues

• Step 1: If your pedals show any signs of wear on the threads, replace them. Pedal wear can lead to improper engagement with the crank arms, causing creaks.
• Step 2: Clean the pedal threads with a degreaser and apply a light coat of grease or anti-seize compound to the threads before reinstalling them.
• Step 3: Tighten the pedals securely according to the manufacturer’s specifications using a pedal wrench [paid link].

Reinstall or Replace the Bottom Bracket

• Step 1: If the bottom bracket is loose, tighten it to the recommended torque setting (40-50Nm).
• Step 2: If the bottom bracket bearings are damaged or rough, remove the bottom bracket and replace it with a new Shimano-compatible bottom bracket.
• Step 3: Once the new bottom bracket is installed, reattach the crankset, ensuring everything is properly aligned and tightened.

Address Chainring and Chain Wear

• Step 1: If the chainring is worn, replace it with a new Shimano-compatible chainring. Ensure that the replacement chainring is designed specifically for the FC-6700 crankset.
• Step 2: Check your chain for wear using a chain checker tool. Replace the chain if it exceeds the recommended wear limit.
• Step 3: Clean and lubricate the new chain before reinstalling it, ensuring smooth engagement with the chainring.

Fix Pedal and Crank Arm Interaction

• Step 1: Clean both the pedal threads and the crank arm pedal holes thoroughly.
• Step 2: Lubricate the pedal threads and reattach the pedals to the crank arms, tightening them to the proper torque specifications (35-40Nm).
• Step 3: Test the bike to ensure there is no further creaking when pedaling.

Preventing Future Noise Issues

To prevent noisy or creaky sounds from reappearing, follow these maintenance tips:

• Regularly Check Crank Arm Bolts: Periodically inspect your crank arm bolts for tightness to avoid any potential issues.
• Maintain Pedals and Bottom Bracket: Keep your pedals and bottom bracket clean and lubricated to ensure smooth operation.
• Monitor Chainring and Chain Condition: Regularly check the condition of your chain and chainring, replacing them when necessary to prevent wear and noise.
• Lubricate Pedal Threads: Always apply grease or anti-seize compound to pedal threads when installing or re-installing them to avoid future creaking.

By following these steps, you can keep your Shimano FC-6700 crankset running smoothly and quietly. Regular maintenance, including proper installation and periodic checks, will help ensure that you get the best performance and durability from your bike’s drivetrain.