The Shimano FD-6700 [paid link] front derailleur, part of the Ultegra 6700 series, is known for precise and reliable front shifting. However, riders often experience noisy shifting if the derailleur is not installed or maintained correctly. This guide explains the exact causes of noise on the FD-6700 [paid link] front derailleur and how to restore smooth, quiet performance.
Understanding Noisy Shifting on the FD-6700
Noise from the FD-6700 [paid link] usually indicates friction between the chain and derailleur cage. Unlike rear derailleur issues, front derailleur noise is almost always linked to positioning errors, cable tension, or limit screw misalignment. Left unresolved, noisy shifting can accelerate drivetrain wear and reduce efficiency.
Tools Required
- 5 mm Allen key
- Phillips screwdriver
- Cable cutters
- Torque wrench [paid link]
- Workstand (recommended)
Checking Front Derailleur Alignment
Correct derailleur positioning is the foundation of silent shifting. The FD-6700 requires precise alignment with the chainrings.
The outer cage plate must sit parallel to the chainring. Even a slight angle will cause rubbing and noise during shifting. Position the derailleur so that the bottom edge of the cage sits 1–3 mm above the tallest chainring tooth. If set higher or lower, noise will occur at certain gear combinations.
Setting Proper Cable Tension
Cable tension plays a central role in FD-6700 performance. If tension is too low, the derailleur will hesitate when moving the chain onto the big ring. Too much tension can push the cage excessively, causing chain rub.
Begin by releasing all cable tension. Then, pull the cable firmly by hand before securing it under the anchor bolt. Fine-tune tension with the barrel adjuster at the shifter, ensuring the derailleur moves crisply without overshooting.
Adjusting Limit Screws to Eliminate Noise
The FD-6700 features two limit screws that control cage travel.
- Low limit screw (L): Adjusts the derailleur’s inward travel. If set too tight, the chain may rub in the small ring. If too loose, the chain may drop toward the bottom bracket.
- High limit screw (H): Adjusts the derailleur’s outward travel. Incorrect adjustment here often causes chain rub in the large ring or even chain drop beyond the big ring.
Turn each screw in small increments while pedaling the bike on a stand. Noise should disappear once the cage is positioned correctly relative to the chain.
Using the FD-6700’s Trim Function
The Shimano FD-6700 front derailleur is designed with a trim feature to reduce noise. When riding in the large chainring with smaller cogs, or in the small chainring with larger cogs, the chain angle increases. This cross-chaining effect causes rubbing, even with correct adjustment.
By slightly pressing the left shifter, the derailleur moves to a secondary trim position. This micro-adjustment pulls the cage away from the chain, eliminating rubbing noises in extreme gear combinations. Understanding and using the trim function is essential for quiet operation.
Inspecting for Cable and Housing Wear
Over time, cables and housing deteriorate. A frayed cable or corroded liner increases friction, leading to delayed shifts and noisy cage movement. For the FD-6700, smooth cable action is critical, as it relies on precise tension to move accurately.
Replace worn cables and housing, ensuring proper lubrication before installation. This step often resolves persistent noise that adjustments alone cannot fix.
Chain and Chainring Wear Considerations
Noise may not always come from the derailleur itself. A worn chain or chainrings can mimic derailleur rub, especially under load. On the FD-6700, worn teeth can cause the chain to ride irregularly, producing vibration and noise.
Inspect the chain for elongation using a wear tool. Check chainrings for hooked or shark-tooth-shaped teeth. Replace worn components before making additional derailleur adjustments.
Compatibility and Set-Up Errors
The FD-6700 was designed for 10-speed drivetrains with specific chainring sizes. Installing it with mismatched cranksets or chains outside of Shimano’s compatibility chart can create alignment issues and constant rubbing.
Always pair the FD-6700 with compatible Shimano Ultegra, 105, or Dura-Ace 10-speed components. Incorrect combinations may shift but often generate excess noise.
Final Testing on the Road
Once adjustments are made, test shifting under real riding conditions. Noise that disappears on a workstand may reappear under pedaling force. Run through all gear combinations, using the trim feature where necessary, and confirm that shifting remains smooth and silent.
Conclusion
The Shimano FD-6700 front derailleur delivers reliable front shifting when installed and adjusted correctly. Noisy shifting is usually the result of cage misalignment, improper cable tension, or neglected limit screw adjustment. By following the steps above, riders can diagnose and eliminate noise while extending the life of their drivetrain. Proper use of the trim function and regular maintenance ensures the FD-6700 continues to perform quietly and efficiently for many miles.