How to Install, Adjust, and Maintain the SM-BB6700

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The Shimano SM-BB6700 [paid link] is a high-quality bottom bracket designed for Hollowtech II cranksets. It features durable steel bearings, a sealed cartridge design, and precise engineering for smooth pedaling efficiency. Proper installation and maintenance are crucial for maximizing its lifespan and preventing performance issues.

This guide covers everything from installation and adjustment to troubleshooting and maintenance to ensure your SM-BB6700 [paid link] performs at its best.

Tools Required

Before starting, gather the following tools:

  • Hollowtech II bottom bracket tool [paid link] (e.g., Shimano TL-FC32 [paid link] or TL-FC33)
  • 5mm and 10mm Allen keys [paid link]
  • Torque wrench [paid link]
  • Anti-seize compound or grease
  • Bottom bracket facing tool (if required)
  • Isopropyl alcohol and a clean rag

How to Install the SM-BB6700 Bottom Bracket

1. Preparing the Bottom Bracket Shell

Before installation, ensure the bottom bracket shell is clean and properly faced:

  • Remove any old grease, dirt, or debris using isopropyl alcohol.
  • If your bike frame is made of aluminum or carbon fiber, apply a light layer of anti-seize or grease to prevent creaking.
  • Check the bottom bracket shell threads for damage and re-thread if necessary.

2. Installing the SM-BB6700 Cups

The SM-BB6700 is a BSA (British Standard Thread) bottom bracket, meaning:

  • Drive-side (right side): Tightens counterclockwise.
  • Non-drive-side (left side): Tightens clockwise.

Steps:

  1. Apply a thin layer of grease to the threads of the bottom bracket shell.
  2. Insert the drive-side cup first, threading it counterclockwise using the Hollowtech II tool. Tighten it until snug.
  3. Insert the non-drive-side cup and thread it clockwise.
  4. Use a torque wrench [paid link] to tighten each cup to 35–50 Nm, per Shimano’s recommendation.

How to Adjust and Install the Crankset on the SM-BB6700

  1. Slide the right crank arm (with the spindle) through the bottom bracket.
  2. Align the left crank arm and insert it onto the spindle.
  3. Tighten the crank preload cap (using a Shimano preload cap tool) until there is no side-to-side movement.
  4. Secure the pinch bolts on the left crank arm to 12–14 Nm using a torque wrench.
  5. Spin the cranks to check for smoothness and ensure no lateral play is present.

Common Installation Mistakes to Avoid

  • Over-tightening the bottom bracket cups: This can cause premature bearing wear and creaking.
  • Skipping frame preparation: Dirt or uneven surfaces can cause misalignment and affect performance.
  • Incorrect thread direction: Forcing the cups in the wrong direction can damage the frame threads.

How to Maintain the SM-BB6700 for Peak Performance

1. Cleaning the Bottom Bracket

  • Remove the crankset and inspect the bottom bracket.
  • Wipe away dirt and old grease with isopropyl alcohol and a clean rag.
  • If water intrusion is visible, consider replacing the bottom bracket seals.

2. Re-Greasing and Checking for Wear

  • Every 3,000–5,000 km, remove the bottom bracket cups and apply fresh grease to the threads.
  • Check for roughness or play in the bearings—if present, replace the bottom bracket.

Troubleshooting Common SM-BB6700 Issues

1. Creaking or Noisy Bottom Bracket

If you hear a creaking noise:

  • Check for dirt or contamination inside the bottom bracket shell.
  • Ensure the cups are properly torqued to 35–50 Nm.
  • If the noise persists, the bearings may be worn and require replacement.

2. Rough or Stiff Pedaling

If the bottom bracket feels rough:

  • The bearings may be contaminated or damaged—replacement is the best option.
  • Check for over-tightened preload on the crankset, which can increase resistance.

When to Replace the SM-BB6700

Signs your bottom bracket needs replacing:

  • Grinding or roughness when spinning the cranks.
  • Excessive lateral play in the crank arms.
  • Persistent creaking even after reinstallation and lubrication.

Conclusion

The Shimano SM-BB6700 is a durable and efficient bottom bracket when installed and maintained correctly. By following this guide, you can ensure smooth performance, prevent common issues, and maximize longevity. Regular cleaning, proper installation, and correct torque settings are essential for getting the best out of your setup.

If you’re experiencing persistent issues or need further optimization, check out our related guides for expert solutions.