The Shimano FD-6700 [paid link] front derailleur is a key component of the Ultegra 6700 series, designed to deliver crisp and reliable front shifting for road bikes. Proper installation, adjustment, and maintenance ensure smooth gear changes and extend the lifespan of the derailleur. In this guide, we’ll cover everything from step-by-step installation to fine-tuning and troubleshooting common issues. Whether you’re upgrading or replacing an existing derailleur, this guide will help you achieve optimal performance.
Tools Required [paid links]
- Allen keys
- Torque wrench (for precise tightening)
- Phillips screwdriver
- Cable cutter
- Chain checker
- Degreaser and rag
Shimano FD-6700 Overview and Compatibility
The Shimano FD-6700 [paid link] is a braze-on or clamp-on front derailleur designed for 2×10-speed drivetrains. It is optimized for use with Shimano Ultegra double chainrings and a 10-speed cassette.
Key Features:
- Optimized for 10-speed drivetrains
- Wide link design for increased rigidity
- Lightweight alloy construction
- Compatible with standard and compact chainrings (53-39T, 50-34T)
- Compatible with Shimano 6700-series STI shifters
Compatibility Notes:
- Works best with Ultegra 6700 cranksets and shifters
- Requires a 10-speed chain for optimal performance
- Can be used with Dura-Ace 7900 or 105 5700 groupsets, but fine-tuning may be needed
Step-by-Step Installation of the Shimano FD-6700
1. Determine Mounting Type
- If using a braze-on derailleur, attach it directly to the frame mount.
- If using a clamp-on derailleur, choose the correct clamp size (34.9mm, 31.8mm, or 28.6mm) and attach it securely.
2. Positioning the Derailleur
- Align the outer cage parallel to the chainrings.
- The bottom edge of the derailleur cage should be 1-3mm above the largest chainring.
- Lightly tighten the mounting bolt so the derailleur stays in place but can still be adjusted.
3. Attaching the Shift Cable
- Shift the front derailleur to the smallest chainring.
- Route the cable through the cable anchor bolt and pull it snug.
- Tighten the bolt to 5-7 Nm to secure the cable.
4. Setting the Limit Screws
The Shimano FD-6700 [paid link] has two limit screws:
- L (Low) screw: Controls movement on the smallest chainring.
- H (High) screw: Controls movement on the largest chainring.
Adjust the L screw:
- Shift to the smallest chainring and largest rear cog.
- Adjust the L screw until the inner cage is about 0.5mm from the chain.
Adjust the H screw:
- Shift to the largest chainring and smallest rear cog.
- Adjust the H screw so the outer cage is about 0.5mm from the chain.
5. Fine-Tuning the Cable Tension
- Shift between chainrings and adjust cable tension using the barrel adjuster.
- If shifting feels slow to the large chainring, increase tension slightly.
- If shifting feels slow to the small chainring, reduce tension.
Adjusting the Shimano FD-6700 for Smooth Shifting
Even after installation, fine-tuning is necessary to prevent chain rub, slow shifts, or over-shifting.
Signs of Incorrect Adjustment
- Chain rubs against derailleur cage in certain gears
- Slow or hesitant shifting to larger or smaller chainrings
- Over-shifting beyond the large chainring
How to Fix These Issues
- If the chain rubs on the cage
- Slightly adjust the limit screws to fine-tune clearance.
- Check if the derailleur is misaligned and re-position if needed.
- If shifting is slow or hesitant
- Increase or decrease cable tension using the barrel adjuster.
- If the derailleur over-shifts
- Adjust the H limit screw slightly inward.
Maintenance and Cleaning
Regular Maintenance Tips
- Clean the derailleur every 200-300 km using a degreaser and rag.
- Lubricate pivot points with a drop of light oil to prevent wear.
- Inspect the derailleur cage for signs of bending or damage.
- Check the shift cable for fraying or corrosion.
When to Replace the Shimano FD-6700
- If the derailleur cage is bent beyond repair.
- If shifting remains poor despite multiple adjustments.
- If the pivots are excessively worn and cause play in the derailleur.
Troubleshooting Common Issues
Problem: Chain Drops When Shifting to the Large Chainring
- Cause: H screw too loose or excessive cable tension.
- Fix: Tighten the H screw slightly and reduce cable tension.
Problem: Chain Rubs on the Derailleur Cage
- Cause: Improper alignment or limit screws set incorrectly.
- Fix: Adjust the derailleur position and fine-tune limit screws.
Problem: Slow Shifting to the Small Chainring
- Cause: Insufficient cable tension or a dirty shift cable.
- Fix: Reduce cable tension slightly and clean/lubricate the cable.
Comparison: Shimano FD-6700 vs. FD-6800
The FD-6700 is often compared to the FD-6800 [paid link] (Ultegra 11-speed). While both are high-performance front derailleurs, key differences include:
| Feature | Shimano FD-6700 | Shimano FD-6800 [paid link] |
|---|---|---|
| Speeds | 10-speed | 11-speed |
| Cable Pull | Conventional | Redesigned for lighter shifting |
| Weight | ~89g | ~79g |
| Compatibility | 10-speed Ultegra 6700 groupset | 11-speed Ultegra 6800 groupset |
| Performance | Reliable shifting | Improved, lighter shifting |
Conclusion
The Shimano FD-6700 front derailleur is a high-performance 10-speed component that, when installed and maintained correctly, delivers smooth and precise shifting. By following proper installation steps, fine-tuning adjustments, and regular maintenance, you can maximize the lifespan and performance of your drivetrain.