The Best Lubrication and Cleaning Routine for Your SM-BB6700

Posted on
in No category

The Shimano SM-BB6700 [paid link] bottom bracket is an integral part of the Ultegra road groupset and plays a vital role in maintaining smooth crank rotation and efficient power transfer. To ensure the longevity and optimal performance of your SM-BB6700 [paid link], establishing a proper lubrication and cleaning routine is essential. This guide provides a comprehensive, model-specific maintenance plan designed to keep your bottom bracket running quietly and efficiently, even under demanding riding conditions.

Understanding the SM-BB6700 [paid link] Bottom Bracket Design

The SM-BB6700 is a Hollowtech II, outboard-style threaded bottom bracket built for use with Shimano’s 24mm spindle cranks. Designed with precision-sealed cartridge bearings, it balances smooth rotation with weather resistance. However, its external cup design makes it more exposed to contamination from road grime, moisture, and cleaning agents—necessitating regular care.

While Shimano promotes the bottom bracket as low-maintenance, riders who regularly train in wet or dusty environments must adopt a proactive cleaning and lubrication schedule to prevent premature bearing wear and corrosion.

Why Lubrication and Cleaning Matter

Proper lubrication and cleaning help in multiple ways:

  • Minimize friction in bearing interfaces.
  • Prevent ingress of dirt, water, and corrosive substances.
  • Extend bearing life and preserve smooth crank rotation.
  • Reduce creaking or clicking sounds caused by contamination or dry interfaces.

Neglecting these steps may lead to corrosion of the bearing surfaces, stiff crank movement, and even bottom bracket failure—requiring premature replacement.

Recommended Cleaning Schedule for the SM-BB6700

For most riders, inspecting and cleaning the bottom bracket every 2,000–3,000 km is sufficient. However, if you ride in wet or muddy conditions frequently, you should shorten the interval to every 1,000–1,500 km.

Post-Ride Quick Maintenance:

  • Wipe the external cups with a clean, dry rag to remove debris.
  • Avoid high-pressure water sprays near the bottom bracket area.

Weekly Cleaning:

  • Use a mild degreaser applied with a cloth or soft brush around the bottom bracket shell.
  • Rinse lightly with water and dry thoroughly.

Deep Cleaning and Lubrication Routine

A full service should be conducted every few months, or any time you detect resistance, noise, or signs of moisture.

Tools Required:

  1. Shimano Hollowtech II bottom bracket tool [paid link] (TL-FC32 [paid link] or TL-FC36 [paid link])
  2. Torque wrench [paid link]
  3. Degreaser (citrus-based or bike-specific)
  4. Waterproof grease (Shimano Dura-Ace grease or equivalent)
  5. Clean microfiber cloths
  6. Anti-seize compound (optional, for alloy frames)

Steps:

  1. Crank Arm Removal:
    • Remove the non-drive side crank arm using the appropriate tool.
    • Slide out the crank spindle, taking care not to damage the seals.
  2. Bottom Bracket Cup Removal:
    • Use the Hollowtech II tool to unscrew both cups from the frame.
    • Clean the cups thoroughly using degreaser and a brush.
    • Wipe clean and inspect the bearings for smoothness.
  3. Frame Shell Inspection and Cleaning:
    • Clean the bottom bracket shell threads with degreaser and a cloth.
    • Remove any grit or debris from the inside of the shell.
  4. Bearing Surface Lubrication:
    • Apply a thin layer of waterproof grease to the threads of the bottom bracket cups.
    • Lubricate the bearing seals lightly to protect against moisture.
    • Avoid overpacking the bearing area—excess grease can attract dirt.
  5. Reinstallation:
    • Thread in the bottom bracket cups, ensuring correct orientation (drive side clockwise, non-drive side counterclockwise).
    • Torque to Shimano’s specification: typically 35–50 Nm.
    • Grease the crank spindle before re-insertion and reassemble the crankset.
  6. Final Check:
    • Spin the cranks to ensure smooth rotation.
    • Listen for unusual noise or drag.
    • Wipe away any excess grease or lubricant.

Best Lubricants for SM-BB6700 Maintenance

Choosing the right lubricant is essential to ensure the best performance without compromising bearing protection.

Recommended Greases:

  • Shimano Dura-Ace Grease: Optimized for bearing longevity and water resistance.
  • Phil Wood Waterproof Grease: Known for high adhesion and durability.
  • Park Tool PPL-1 Polylube: Affordable and effective general-purpose grease.

What to Avoid:

  • Light oils or chain lubricants—these lack the viscosity needed for sealed bearings and can cause premature contamination.
  • Heavy automotive greases—often too thick for fine-tolerance bike components.

Common Mistakes in SM-BB6700 Lubrication

Improper cleaning or lubrication can do more harm than good. Here are common mistakes to avoid:

  • Using high-pressure water directly on the bottom bracket.
  • Over-greasing the bearings or cup threads.
  • Ignoring signs of contamination, such as grinding or squeaking.
  • Reinstalling without cleaning old grease and debris thoroughly.

Preventing Long-Term Wear and Corrosion

Even the best bottom bracket won’t last forever, but with routine care, the SM-BB6700 can easily exceed 10,000 km without issues. Use frame protectors or integrated fenders in wet conditions to reduce direct water ingress. Additionally, always check for creaking noises, which often indicate a dry or contaminated interface.

FAQs: SM-BB6700 Lubrication and Cleaning

1. How often should I clean and lube the SM-BB6700?
Every 2,000–3,000 km under normal conditions, or sooner in wet or dusty environments.

2. Can I use WD-40 on the SM-BB6700?
No, WD-40 is a degreaser, not a lubricant. Use high-quality waterproof grease instead.

3. Should I replace the bottom bracket if it feels gritty?
If bearing smoothness cannot be restored after cleaning and greasing, replacement is recommended.

4. What grease does Shimano recommend for the SM-BB6700?
Shimano Dura-Ace grease is the preferred option for optimal performance.

5. Can I perform this maintenance myself, or do I need a shop?
With basic tools and care, this is a DIY-friendly procedure for most riders.

6. Is anti-seize needed during installation?
Only use anti-seize on alloy frame threads prone to corrosion; otherwise, grease is sufficient.

Conclusion

A consistent lubrication and cleaning routine is the foundation of long-term performance for your Shimano SM-BB6700 bottom bracket. By following these maintenance practices, you’ll not only ensure smoother rides but also reduce the risk of unexpected mechanical issues. With just a few tools and a little time, you can preserve your investment and keep your drivetrain spinning efficiently for thousands of kilometers.