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The Shimano Tiagra FD-4700 brazed-on front derailleur marks a significant upgrade over previous Tiagra generations, reflecting Shimano’s effort to bring more refined shifting technology to the entry-level 10-speed road segment. This derailleur blends high-performance features inspired by the 105 and Ultegra groupsets with the durability and affordability that recreational and fitness riders need.

The brazed-on mount type offers a secure and precise connection to the frame, minimizing flex and ensuring that the derailleur cage aligns perfectly with the chainrings — a critical factor for crisp, reliable front shifting.


⚙️ Engineering Highlights:

  • Wide Link Design:
    The wide link cage increases rigidity, reducing flex during shifts. This rigidity leads to smoother and more positive chain engagement, especially important under load when climbing or sprinting.

  • Improved Cage Shape:
    The redesigned cage geometry accommodates modern chainring sizes (34–52 teeth) and wider 10-speed chains, reducing chain drop and rub.

  • Cable Routing:
    This model is a bottom-pull type, compatible with most road frames designed for the 4700 series. The cable tension and routing optimize shifting speed and consistency.

  • Lightweight Construction:
    Despite its solid build, the FD-4700 remains lightweight (~90 grams), contributing to overall bike performance without adding unnecessary weight.


🔄 Performance in Real-World Use:

  • The FD-4700 delivers precise front shifts with minimal effort, even under heavy pedaling loads, thanks to its stiff cage and optimized geometry.

  • It responds well to fine tuning, allowing mechanics and riders to dial in perfect chainring changes, reducing noise and chain rub.

  • While designed for 10-speed systems, it performs best with compatible Tiagra 4700 shifters, although it can work with other 10-speed road shifters if properly adjusted.


Pros:

  • Great balance of cost, weight, and performance

  • Durable construction with wide link design

  • Smooth, crisp shifting on 10-speed road setups

  • Compatible with a broad range of chainring sizes

  • Reliable in various weather and road conditions

Cons:

  • Limited to 10-speed drivetrains; upgrading to 11 or 12-speed requires different derailleurs

  • Requires precise adjustment to avoid chain rub on some frames

  • Not compatible with non-road or triple chainring setups


🧰 Ideal For:

  • Enthusiast road cyclists stepping up from 8/9-speed systems

  • Fitness riders and commuters wanting reliable 10-speed shifting

  • Mechanics and DIY cyclists seeking affordable, quality components for 10-speed builds