The Shimano FD-6700 [paid link] front derailleur, part of the Ultegra 6700 series, is well-regarded for its precise shifting and durability. However, many riders experience a derailleur that “feels off.” This typically shows up as sluggish shifts, chain rub, or inconsistent performance under load. Fortunately, most of these issues stem from setup errors or minor wear that can be corrected quickly. This guide explains why the FD-6700 [paid link] may feel misaligned and how to restore crisp, reliable shifting.
Understanding the FD-6700 Front Derailleur
The Shimano FD-6700 [paid link] is a braze-on or clamp-style front derailleur designed for 10-speed drivetrains. It uses a wide-link construction for improved rigidity and features a lightweight aluminum build. When properly adjusted, it delivers fast, accurate front shifts with minimal effort. Yet because of its precise tolerances, even small deviations in cable tension, alignment, or limit screw settings can compromise performance.
Common Reasons the FD-6700 Feels Off
Several factors can cause the FD-6700 front derailleur to feel poorly tuned:
- Incorrect alignment: If the cage is not parallel to the chainrings or sits at the wrong height, shifting efficiency drops.
- Cable stretch: Over time, derailleur cables lose tension, leading to sluggish or incomplete shifts.
- Improper limit screw adjustment: Misadjusted screws either restrict cage movement or allow over-shifting, causing chain drops.
- Worn components: A stretched chain, worn chainrings, or damaged derailleur cage can all mimic poor adjustment.
- Frame flex or clamp slippage: On clamp-style versions, a loose clamp bolt can cause the derailleur to move slightly, upsetting alignment.
How to Instantly Improve FD-6700 Performance
Correct the Cage Alignment
The derailleur cage should sit 1–3 mm above the tallest chainring tooth. It must also be perfectly parallel to the chainrings. Even a small misalignment creates unnecessary friction and delayed shifts. Loosen the mounting bolt, adjust the cage position, and retighten firmly to the frame’s torque specification.
Reset Cable Tension
Cables naturally stretch after use, especially if the derailleur was recently installed. To restore proper tension, shift into the small chainring, release any slack, and use the barrel adjuster to fine-tune. A slight increase in tension often eliminates hesitation when shifting to the big ring.
Fine-Tune Limit Screws
The FD-6700 uses high and low limit screws to define the derailleur’s movement range. If the high limit is set too tight, the chain will struggle to move onto the large chainring. If the low limit is too loose, the chain may drop inside the small chainring. Adjust in small increments, testing shifts after each adjustment.
Inspect the Drivetrain
A derailleur cannot compensate for worn drivetrain parts. Check for chain stretch with a wear indicator and examine the chainrings for shark-tooth wear patterns. Replace components as necessary, since no amount of adjustment will correct a worn system.
Optimizing the FD-6700 for Better Performance
Once basic adjustments are complete, further refinements can maximize performance. Applying light lubrication to the pivot points reduces friction and improves responsiveness. Keeping the derailleur cage free of grime ensures clean, quiet operation. Riders seeking even smoother shifting may pair the FD-6700 with Shimano’s polymer-coated cables, which reduce drag within the housing.
Additionally, riders should check crankset compatibility. The FD-6700 was engineered for Shimano’s 10-speed road cranksets, and mixing it with non-matching chainrings may cause subpar shifting. Ensuring proper component pairing prevents misalignment and unnecessary frustration.
When to Consider Replacement
Even with perfect adjustment, a derailleur may eventually wear beyond repair. Signs include excessive play in the pivots, a bent cage, or a clamp that no longer holds securely. If shifting issues persist after thorough adjustment and inspection, replacement with a new FD-6700 or a compatible modern upgrade may be the best solution.
Conclusion
The Shimano FD-6700 front derailleur is a precise component that rewards careful setup. When it feels off, the root causes usually lie in alignment, cable tension, or limit screw settings rather than major mechanical failure. By methodically correcting these areas, riders can restore the crisp, accurate front shifting the Ultegra 6700 series is known for. Regular inspection, proper lubrication, and drivetrain compatibility checks ensure long-lasting performance and keep the FD-6700 running like new.