Can You Upgrade Your FD-6700 Front Derailleur? Compatibility and Best Practices

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The Shimano FD-6700 [paid link] front derailleur belongs to the Ultegra 6700 series, a 10-speed road groupset that was widely used for its reliable shifting and solid build quality. Riders who continue to run this derailleur often wonder if upgrading is possible, whether to a newer Shimano series or to improve performance within the existing 10-speed platform. This guide explores compatibility considerations, upgrade paths, and best practices for getting the most out of the FD-6700 [paid link].

Understanding the FD-6700 Front Derailleur

The FD-6700 [paid link] is a braze-on or clamp-style front derailleur designed for Shimano’s 10-speed road drivetrains. It features wide-link construction for rigidity, optimized for 10-speed chainrings with a 16-tooth maximum capacity difference. This model was engineered to pair with Shimano Ultegra ST-6700 [paid link] shifters and 10-speed double cranksets. Its shifting profile is tailored to narrower 10-speed chains and the chainring spacing typical of the 6700 groupset.

Compatibility with Drivetrain Generations

When considering an upgrade or replacement, compatibility across drivetrain generations is critical. The FD-6700 is specifically designed for Shimano 10-speed systems. It works best when paired with matching 10-speed Ultegra, 105 (5700 series), or Dura-Ace (7900 series) components. Using it with 9-speed or 11-speed setups introduces problems:

  • 9-speed systems: The chain and chainring spacing differ, leading to poor shifting and chain rub.
  • 11-speed systems: The derailleur cage shape and actuation ratio differ, which often prevents precise shifting.

For optimal performance, riders should stick to 10-speed groupsets. Attempting to mix across generations usually results in reduced accuracy and increased drivetrain noise.

Upgrading Within the 10-Speed Platform

If you want to improve performance without moving to a new speed standard, several options are available:

  • Dura-Ace FD-7900 [paid link]: Offers slightly crisper shifts with lighter materials, but the compatibility is seamless with 10-speed Shimano drivetrains.
  • 105 FD-5700 [paid link]: A more affordable option that provides similar performance to Ultegra, though with slightly heavier construction.
  • FD-6700-A Revision: Shimano later released a revised FD-6700-A version with minor improvements in shifting response, making it a subtle but worthwhile upgrade.

These options keep the drivetrain consistent while enhancing durability or shifting quality.

Considering an 11-Speed Upgrade

Cyclists looking for a bigger performance boost may consider moving to 11-speed drivetrains, such as Ultegra 6800, 8000, or newer series. However, the FD-6700 cannot be directly upgraded into these systems due to cage geometry and actuation ratio differences. A full front-end upgrade is required, including:

  • 11-speed STI shifters
  • Compatible crankset with 11-speed chainrings
  • 11-speed chain
  • 11-speed front derailleur (e.g., FD-6800 [paid link] or FD-R8000 [paid link])

This transition provides smoother shifting and improved chainline, but it requires replacing multiple components, making it a more costly upgrade path.

Best Practices for Maximizing FD-6700 Performance

Before replacing the FD-6700, ensure it is set up correctly and well maintained. Many riders replace parts prematurely when adjustments or maintenance would restore full function.

  • Proper Setup: Verify that the derailleur height and alignment match Shimano’s specifications. The outer cage should sit parallel to the chainrings with 1–2mm clearance above the teeth.
  • Cable Tension: Correct cable tension is essential for crisp shifts. Frayed or corroded cables should be replaced immediately.
  • Limit Screw Adjustment: Fine-tune the high and low limit screws to prevent overshifting or chain rub.
  • Regular Cleaning: Dirt buildup reduces performance. Cleaning the cage and lubricating the pivot points restores smooth operation.
  • Use of Genuine Chains and Chainrings: Mixing brands or models outside Shimano’s design often leads to reduced efficiency.

With proper care, the FD-6700 continues to perform reliably for many riders.

When Replacement Becomes Necessary

The FD-6700 is built to last, but like all mechanical parts, it will eventually wear out. Signs that indicate a need for replacement include excessive play in the pivots, cage deformation, or failure to hold alignment despite correct setup. If these occur, upgrading within the 10-speed platform or moving to an 11-speed system becomes the logical step.

Conclusion

Upgrading the FD-6700 front derailleur depends on your long-term goals. If you plan to stay with a 10-speed drivetrain, moving to a Dura-Ace FD-7900 [paid link] or the revised FD-6700-A offers improved performance without requiring major changes. If you aim for modern features and smoother shifting, a full upgrade to an 11-speed system is necessary. For most riders, however, careful setup, maintenance, and correct compatibility checks ensure the FD-6700 remains a dependable component for years.