The Shimano FC-6700 [paid link] crankset is a key component of the Ultegra 6700 groupset, designed for road cyclists seeking precise power transfer and durability. Whether you are upgrading, replacing, or simply maintaining your FC-6700 [paid link] crankset, understanding proper installation and maintenance is crucial for long-term performance.
This guide will cover installation steps, adjustments, and maintenance to ensure your Shimano FC-6700 crankset remains in top condition.
Tools Required
- 5mm and 8mm Allen wrenches
- Torque wrench (with Nm settings)
- Shimano Hollowtech II bottom bracket tool
- Bottom bracket grease
- Isopropyl alcohol and clean cloth
- Crank arm preload tool
Step-by-Step Installation of the FC-6700 Crankset
1. Preparing the Bottom Bracket Shell
Before installing the FC-6700 crankset, ensure the bottom bracket shell is clean and free from debris.
- Remove any old grease and dirt using isopropyl alcohol.
- If installing a new bottom bracket, apply a thin layer of anti-seize or grease to the threads (for threaded BB) or press-fit cups (for press-fit BB).
2. Installing the Bottom Bracket (Hollowtech II Compatible)
The FC-6700 crankset is designed for Shimano’s Hollowtech II bottom bracket system.
- Thread the bottom bracket cups into the frame, ensuring proper left/right orientation.
- Use the Shimano Hollowtech II tool to tighten each cup to the manufacturer’s torque specification (typically 35-50 Nm).
3. Installing the Crank Arms
- Apply a light layer of grease to the crank spindle and bottom bracket interface to prevent creaking.
- Insert the right-side crank arm (with chainrings) through the bottom bracket.
- Align the left-side crank arm with the spindle splines and slide it onto the spindle.
4. Tightening the Preload Cap and Bolts
- Use the crank arm preload tool to snugly tighten the preload cap by hand. Do not overtighten.
- Tighten the two 5mm pinch bolts on the left crank arm in a balanced manner, alternating between bolts.
- Use a torque wrench [paid link] to tighten these bolts to 12-14 Nm.
Adjusting the FC-6700 Crankset for Optimal Performance
1. Checking Chainring Alignment
After installation, inspect the chainring alignment to ensure proper shifting.
- Pedal the bike and shift through the front derailleur to verify smooth operation.
- If chain rub or sluggish shifting occurs, adjust the front derailleur height and limit screws.
2. Ensuring Proper Torque and Security
- Double-check the crank arm bolts after the first few rides, as they may settle slightly.
- Re-torque the preload cap and bolts if any movement or clicking sounds develop.
3. Fine-Tuning the Bottom Bracket Interface
- If creaking occurs, reapply grease to the spindle and bottom bracket cups.
- If excessive play is noticed, re-tighten the crank preload cap and pinch bolts.
Routine Maintenance for the FC-6700 Crankset
1. Cleaning and Lubrication
- Wipe down the crank arms and chainrings after every ride to prevent dirt buildup.
- Apply chain lube sparingly to the chainrings to prevent excessive wear.
2. Inspecting for Wear and Damage
- Check the chainrings for hooked teeth, a sign of wear requiring replacement.
- Inspect the bottom bracket bearings for smooth rotation—replace if they feel rough or gritty.
3. Replacing the Bottom Bracket Bearings
If the Hollowtech II bottom bracket develops play or grinding, replacement is necessary:
- Remove the crankset and bottom bracket using the Shimano Hollowtech II tool.
- Install a new compatible bottom bracket and grease the threads or cups.
- Reinstall the FC-6700 crankset following the installation steps above.
Troubleshooting Common Issues
1. Creaking or Clicking Sounds
- Check that the crank bolts and preload cap are properly torqued.
- Remove and reapply grease to the bottom bracket and spindle interface.
2. Crankset Feels Loose
- Inspect the preload cap—if too loose, tighten slightly and re-torque the pinch bolts.
- Ensure the bottom bracket cups are fully tightened to the frame’s shell.
3. Poor Shifting Performance
- Adjust the front derailleur alignment if chain rub occurs.
- Ensure the chain is in good condition and not overly stretched.
FC-6700 Crankset vs. Similar Models
The FC-6700 is often compared to other Shimano road cranksets like the FC-6800 [paid link] (Ultegra 6800) and FC-7900 [paid link] (Dura-Ace 7900).
| Feature | FC-6700 (Ultegra) | FC-6800 [paid link] (Ultegra) | FC-7900 [paid link] (Dura-Ace) |
|---|---|---|---|
| Crank Arm Material | Hollowtech II Aluminum | Hollowtech II Aluminum | Hollowtech II Aluminum |
| Chainring Design | 5-arm, Standard & Compact | 4-arm, Standard & Compact | 5-arm, Standard & Compact |
| Weight (approx.) | 785g | 765g | 725g |
| Shifting Quality | Smooth & Reliable | Smoother, Improved Stiffness | Best Performance, Lightest |
The FC-6800 introduced a 4-arm design, while the FC-7900 is lighter and designed for Dura-Ace-level [paid link] performance. However, the FC-6700 remains an excellent choice for road cyclists looking for performance and durability at a lower cost.
Conclusion
The Shimano FC-6700 crankset remains a reliable and high-performing component for road cyclists. By following proper installation, adjustments, and maintenance practices, you can ensure smooth operation and long-lasting performance.