SHIMANO FD-M670A Slx Front Derailleur

( Brand: Shimano ), ( Manufacturer Part Number: FD-M670A ), ( Model: SHIMANO SLX FD-M670A ), ( Part Type: Derailleur ), ( Cable Pull Type: Bottom Pull )

Review SHIMANO Slx Front Derailleur

The **Shimano FD-M670A SLX Front Derailleur** is a robust and precision-engineered component designed to deliver reliable performance in demanding off-road conditions, making it an excellent choice for serious mountain bikers and trail riders seeking a balance of durability, efficiency, and ease of use. Part of Shimano s SLX series, this front derailleur is built to withstand the rigors of aggressive riding, from steep descents and rough terrain to technical climbs, while maintaining smooth shifting and consistent gear engagement. Crafted with a **durable aluminum alloy frame**, the FD-M670A is engineered to resist bending, warping, or fatigue over extended use, ensuring long-term reliability even under heavy loads. Its **compact design** minimizes interference with suspension travel and wheel clearance, allowing for a more aggressive riding stance and better handling on tight trails.

One of the standout features of the SLX front derailleur is its **smooth and precise shifting performance**, achieved through Shimano s proprietary **Quick Release (QR) lever system** and optimized cable routing. The derailleur s **high-quality bearings** and **sealed cartridge pivot system** reduce friction and wear, ensuring consistent shifting even in wet or muddy conditions where debris might otherwise compromise performance. The **adjustable limit screws** provide fine-tuned control over gear range, allowing riders to fine-tune the derailleur s operation for their specific bike setup, whether they prefer a wider or narrower gear spread. Additionally, the **durable steel cage** is designed to handle the stresses of aggressive riding, with reinforced construction to prevent sagging or misalignment over time.

For added convenience and versatility, the FD-M670A SLX is compatible with Shimano s **Deore and SLX drivetrain components**, making it a seamless fit for riders upgrading or building a system with other parts from the same series. The derailleur s **quick-release mechanism** allows for easy installation and removal, simplifying maintenance and adjustments, while its **durable paint finish** resists chipping and corrosion, ensuring it remains looking sharp even after years of use. Whether tackling a challenging enduro race, carving through technical singletrack, or simply pushing the limits on a weekend ride, the Shimano FD-M670A SLX front derailleur delivers the strength, responsiveness, and reliability that serious riders demand. Its combination of **durability, shifting consistency, and compatibility** makes it a standout choice for those who refuse to compromise on performance.

The Shimano FD-M670A SLX front derailleur is a mid-range component designed for mountain biking, offering a balance between performance and cost. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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1. **Durability and Reliability:** The SLX series is known for its robust construction, making it suitable for aggressive riding and rough terrain. The build quality is generally solid, with fewer plastic components compared to lower-tier models, which reduces the risk of premature wear or failure.

2. **Performance:** The M670A provides smooth shifting and good chain alignment, which is crucial for efficient pedaling and reduced wear on the chain and cassette. It handles cross-chaining better than some lower-tier derailleurs, though it may not match the precision of higher-end models like the XT or Deore.

3. **Compatibility:** The FD-M670A is compatible with a wide range of frames and forks, including those with 24mm and 30mm BB widths (though it works best with 24mm BBs for optimal performance). It also supports 1x, 2x, and triple chainset setups, though it is primarily designed for 1x drivetrains, which are common in modern mountain bikes.

4. **Maintenance:** While it requires regular cleaning and lubrication like any derailleur, the SLX series is relatively easy to maintain. Shimano s parts are widely available, and the design is straightforward, making adjustments and repairs accessible even for beginners.

5. **Value for Money:** Compared to higher-end Shimano models (e.g., XT or Saint), the SLX offers a good balance of performance and cost. It is a cost-effective choice for riders who want reliable shifting without investing in the most expensive components.

6. **Weight:** The M670A is lighter than some budget derailleurs, which can contribute to a more responsive bike feel, though the weight difference is minimal compared to higher-tier models.

7. **Shimano s Ecosystem:** If you are building or upgrading a Shimano drivetrain, the SLX derailleur integrates well with other Shimano components (e.g., cassettes, cranks, and rear derailleurs), ensuring consistent performance and compatibility.

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1. **Limited Performance Compared to Higher Tiers:** While the SLX derailleur is capable, it does not match the precision, smoothness, or durability of higher-end models like the XT or Saint. Riders who demand near-perfect shifting or plan to push their bike to extreme limits may find the SLX lacking.

2. **Cross-Chaining Limitations:** Although better than budget derailleurs, the M670A still struggles with cross-chaining (shifting between the smallest and largest chainrings). This can lead to increased chain wear and less efficient pedaling, especially in 2x or triple setups.

3. **Build Quality Variability:** While generally durable, some users report inconsistencies in build quality, particularly in cheaper batches. This can manifest as slight misalignments or weaker plastic components, though this is less common with newer models.

4. **Limited Upgrade Path:** If you eventually decide to upgrade your drivetrain, the SLX derailleur may not be as future-proof as higher-tier models. For example, it may not perform as well with wider-range cassettes or more aggressive chainline adjustments.

5. **No Electronic Shifting:** The SLano FD-M670A is a mechanical derailleur, which means it lacks the convenience and precision of electronic shifting systems. While this is not a dealbreaker for most riders, those who prioritize ease of use or advanced features may prefer electronic options.

6. **Slightly Noisier:** Compared to higher-end derailleurs, the SLX can be slightly noisier, particularly when shifting under load or in rough terrain. This is usually minor but may be noticeable to riders who prioritize quiet operation.

7. **Chainline Sensitivity:** The M670A is more sensitive to chainline adjustments than higher-tier models. Small misalignments can lead to poor shifting or increased chain wear, requiring careful installation and occasional fine-tuning.

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The Shimano FD-M670A SLX front derailleur is a solid mid-range option for mountain bikers who seek a balance between performance and affordability. It excels in durability, reliability, and compatibility, making it a practical choice for casual to intermediate riders, as well as those building a budget-friendly drivetrain. However, it falls short for riders who demand the highest level of shifting precision, cross-chaining performance, or plan to upgrade to wider-range setups in the future. If your priorities align with value, ease of maintenance, and consistent shifting for everyday riding, the SLX is a worthwhile investment. For those who prioritize performance above all else or plan to ride aggressively, investing in a higher-tier derailleur (e.g., XT or Saint) may be justified.

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- You are building or upgrading a mid-range mountain bike and want a reliable, cost-effective derailleur.

- Your riding style is casual to intermediate, with occasional aggressive riding but not extreme.

- You are using a 1x drivetrain or a 2x setup where cross-chaining is not a major concern.

- You prefer Shimano s ecosystem and want parts that are easy to find and maintain.

- You are on a budget but still want a component that delivers solid performance without sacrificing too much quality.

- You prioritize the highest level of shifting precision and smoothness, and are willing to pay for it.

- You plan to use a wide-range cassette or ride in conditions where cross-chaining is frequent.

- You anticipate upgrading to a higher-tier drivetrain in the near future and want a more future-proof component.

- You ride aggressively or in extreme conditions where durability and performance are critical, and you are considering higher-end options like the XT or Saint.

For most riders, the SLX strikes a reasonable compromise, but it is not the best choice for those who demand perfection or plan to push their bike to its limits. If you can afford it, stepping up to the XT or Saint series may yield noticeable improvements in performance and longevity.

Details:

Good condition Shimano SLX FD-M670A Front derailleur. Don't hesitate to reach out with any questions or offers. Who we are: Community Bikes is a reuse and repair training program operated by LITE initiatives. Ready to rock and roll, check all photos for a full sense of condition.

part #: fdm670a prices

• $15.00-$35.14

specifications ribicycl:

• brand: Shimano
• mpn: Fd-m670a
• model: Shimano Slx Fd-m670a
• part type: Derailleur
• cable pull type: Bottom Pull

payments ribicycl:

• credit card: Discover
• other
• wallet: Paypal

offer ribicycl:

• best offers: True
• started: May 27, 2026
• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock

shipping ribicycl:

• cost: $8.75
• service: USPS Ground Advantage
• type: Calculated
• carrier: USPS
• transit: 9-13 Days
• class: Standard

general ribicycl:

• Cycling > Bicycle Components Parts > Front Derailleurs
• condition: Used

seller ribicycl:

• city: Santa Rosa, California
• # reviews: 359
• rating: 99.0%

returns ribicycl:

• policy: No Returns

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