SHIMANO FD-6870-F Ultegra Braze Front Derailleur 4524667929826 DI2

( Brand: Shimano ), ( Manufacturer Part Number: FD-6870-F ), ( Part Type: Derailleur ), ( Cable Pull Type: Dual Pull ), ( Color: Silver ), ( Compatible Bike Type: Road Bike ), ( Material: Aluminum Alloy ), ( Mounting Type: Braze-on ), ( Number Of Chainrings: Double ), ( Number Of Speeds: 11 Speed ), ( UPC: 524667929826 )

Review SHIMANO Ultegra Braze on Di2 Front Derailleur Excellent

The **Shimano FD-6870-F ULTEGRA Braze-On Di2 Front Derailleur** represents the pinnacle of precision engineering and performance in modern road cycling, designed exclusively for Shimano s cutting-edge **Di2 electronic shifting system**. This front derailleur is a critical component for riders seeking seamless, ultra-responsive gear changes while maintaining the lightweight and compact profile demanded by high-performance road bikes. Built with **ULTEGRA-grade components**, the FD-6870-F delivers the same refined quality and durability as its group s higher-end counterparts, ensuring reliability across a wide range of riding conditions, from grueling climbs to aggressive descents. The **braze-on mounting system** allows for a clean, integrated installation, eliminating the need for a separate clamp and reducing weight while maximizing stiffness ideal for carbon and high-modulus aluminum frames where every gram and millimeter of clearance matters. Engineered with **Shimano s advanced Di2 compatibility**, this derailleur pairs flawlessly with the **FD-6870 Di2 front derailleur** and its corresponding **FD-6870-F Braze-On version**, offering **wireless, electronic shifting** that eliminates cable friction and ensures near-instantaneous, precise shifts with minimal effort. The **pivot design** incorporates **high-strength steel** for durability, while the **anodized aluminum cage** resists corrosion and maintains structural integrity even under the most demanding conditions. With a **shift range of 24 teeth** (adjustable via the Di2 system), the FD-6870-F accommodates a wide variety of crankset setups, from compact double chainsets to triple configurations, providing versatility without sacrificing performance. Its **low-profile design** ensures compatibility with modern frame geometries, including those with aggressive head tube angles and tight chainstay clearances, making it a perfect fit for aero road bikes and endurance-oriented rigs. Whether tackling a time trial or a century ride, this derailleur delivers the **consistency, smoothness, and efficiency** expected from Shimano s premium offerings, reinforcing why it remains a top-tier choice for serious cyclists who demand nothing less than perfection in their gear.

The **Shimano FD-6870-F Ultegra Braze-On Di2 Front Derailleur** is a high-end component designed for serious cyclists seeking precision, reliability, and performance. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Ultra-Lightweight Design**

The FD-6870-F is one of Shimano s lightest front derailleurs, weighing just **100g**. This reduces rotational mass and improves acceleration, which is beneficial for climbers and time trialists.

2. **Di2 Wireless Electronic Shifting**

As part of Shimano s Di2 system, this derailleur offers **smooth, precise, and consistent shifting** without cable friction. The wireless operation eliminates cable maintenance and provides instant response, which is ideal for competitive riding or long-distance tours where reliability is critical.

3. **Braze-On Mounting**

The **braze-on design** allows for a cleaner, more aerodynamic frame build by eliminating the need for a traditional bolt-on hanger. This is particularly advantageous for carbon fiber frames, where weight savings and stiffness are prioritized.

4. **High Durability and Build Quality**

Shimano s Ultegra components are built to last, with **high-grade materials and robust construction**. The FD-6870-F is designed to handle aggressive riding conditions, including rough terrain and high-speed shifting demands.

5. **Compatibility with Wide-Range Groupsets**

The FD-6870-F works seamlessly with **Ultegra 6800/6700 groupsets**, as well as some higher-end models like the Dura-Ace 9100/9000. This makes it a versatile choice for riders upgrading or customizing their setup.

6. **Low Maintenance**

Since Di2 is wireless, there s no need for cable replacement or lubrication, reducing long-term upkeep. The only maintenance required is occasional cleaning of the derailleur body and occasional checks of the battery (if using a Di2 battery pack).

7. **Precision Indexing**

Di2 shifting is known for its **consistent indexing**, ensuring that each gear change is accurate and repeatable. This is particularly useful in hilly or technical terrain where precise control is necessary.

8. **Compatibility with Shimano s E-Tube System**

If you re using a **Shimano E-Tube (e.g., E8000 or E5000)**, this derailleur integrates smoothly with the system, allowing for seamless integration with electronic accessories like power meters or navigation devices.

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### **Cons**

1. **High Cost**

The FD-6870-F is **expensive**, typically costing **$300 $400 USD** depending on the retailer and region. This makes it a significant investment, especially if you re on a budget or only occasionally ride at a high performance level.

2. **Limited Availability of Spare Parts**

While Ultegra components are widely available, **Di2-specific parts (e.g., batteries, controllers, or replacement derailleurs) can be harder to find** compared to mechanical shifting systems. This may lead to longer wait times for repairs or replacements.

3. **Dependence on Di2 Battery**

Di2 systems require a **battery pack** (usually a 18650 or 18350 cell), which has a **limited lifespan (typically 3 5 years)**. If the battery fails, you ll need to replace it, adding to long-term costs. Some riders also report **battery drain issues** if the system isn t used regularly.

4. **Potential for Electronic Malfunctions**

While rare, **electronic components can fail** due to water ingress, software glitches, or manufacturing defects. Unlike mechanical derailleurs, Di2 systems require **diagnostic tools** (like Shimano s Di2 Tool or third-party apps) to troubleshoot issues, which may not be as straightforward for casual riders.

5. **Weight Sensitivity in Some Cases**

While the FD-6870-F is lightweight, **some riders prefer mechanical derailleurs** for their simplicity and robustness, especially in extreme conditions (e.g., muddy or off-road riding). Mechanical systems are generally more forgiving in harsh environments.

6. **Compatibility Issues with Non-Shimano Systems**

If you re using **non-Shimano components** (e.g., Campagnolo, SRAM Axeon, or even other Shimano groupsets like Deore or 105), the FD-6870-F may not work seamlessly. While it can be adapted, some riders report **shifting inconsistencies** when mixing brands.

7. **Learning Curve for Di2**

Di2 shifting requires **familiarization** with the system s nuances, such as **shift mapping, sensitivity settings, and battery management**. New users may experience **initial frustration** if they re used to mechanical shifting.

8. **Potential for Overkill for Casual Riders**

If you re a **recreational rider** who doesn t shift frequently or ride in extreme conditions, the **performance benefits of Di2 may not justify the cost**. A mechanical Ultegra or even a mid-range groupset (e.g., 105) might offer better value.

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### **Conclusion**

The **Shimano FD-6870-F Ultegra Braze-On Di2 Front Derailleur** is a **premium choice** for cyclists who prioritize **smooth, precise, and wireless shifting** while also valuing **lightweight construction and high build quality**. It excels in **competitive racing, endurance riding, and applications where reliability and consistency are critical**. However, its **high cost, dependency on battery life, and potential electronic complexities** make it less ideal for casual riders or those on a tight budget.

If you re already invested in **Shimano s Di2 ecosystem**, this derailleur is a **logical upgrade** that will enhance your riding experience. For riders who prefer **simplicity, lower cost, or off-road durability**, a **mechanical Ultegra or a different groupset** might be a better fit.

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### **Recommendation**

- You re already using **Shimano Di2** and want to maintain consistency in your groupset.

- You ride **competitively or at a high intensity**, where **smooth shifting and weight savings** matter.

- You re building a **carbon frame with braze-on compatibility** and want the lightest possible setup.

- You re willing to **invest in a high-end electronic shifting system** and don t mind occasional maintenance (e.g., battery checks).

- You re on a **tight budget** and can achieve similar performance with a **mechanical Ultegra or 105 derailleur**.

- You ride **mostly on gravel, dirt, or in extreme conditions** where mechanical shifting is more reliable.

- You re **not already using Di2** and don t want to deal with **battery management or electronic troubleshooting**.

- You prefer **simplicity and lower maintenance** over wireless precision.

- If you like the **Ultegra performance but want mechanical shifting**, the **FD-6700 (Braze-On Mechanical)** is a great alternative.

- If you re open to **non-Shimano**, **Campagnolo s Centaur or Super Record** offer excellent electronic shifting with different trade-offs.

- If you re upgrading from **105 or lower**, consider **staying with mechanical shifting** unless you re fully committed to Di2 s benefits.

Ultimately, the FD-6870-F is a **top-tier derailleur** for the right rider one who demands **the best in electronic shifting and lightweight construction**. For everyone else, there are more accessible options that still deliver strong performance.

Details:

It mounts via braze-on, pairing exclusively with Shimano Di2 sifters like ST-6870. We currently have the following examples of this item in stock. Browse the selections above or view items below. Shimano Ultegra FD-6870-F Braze-On Di2 Front Derailleur EXCELLENT In excellent condition with some light wear to the cage from prior use.

Detailed s: Every product is accompanied by an individual outlining its unique features, specifications, and any noted imperfections. Excellent Lightly used, with minimal signs of wear. Latest firmware. We evaluate each component based on the factors that matter most for part type.

#Road #11 Speed #Di2 #Electronic Shifting #Braze-on The Shimano Ultegra FD-6870-F is an electronic Di2 front derailleur designed for 11-speed road bikes with double chainrings. Shimano Ultegra FD-6870-F Braze-On Di2 Front Derailleur EXCELLENT > Equip your training with Would've today. N/A Used Not new; definitely used; working, but only evaluated at a generic level.

part #: fd6870 prices

• $49.99-$147.98

specifications ribicycl:

• brand: Shimano
• mpn: Fd-6870-f
• part type: Derailleur
• cable pull type: Dual Pull
• color: Silver
• compatible bike type: Road Bike
• material: Aluminum Alloy
• mounting type: Braze-on
• number of chainrings: Double
• number of speeds: 11 Speed
• upc: 524667929826

shipping ribicycl:

• cost: $0.00
• service: USPS Ground Advantage
• transit: 4-9 Days
• type: Fixed
• class: Standard
• carrier: USPS

offer ribicycl:

• options: Ship-to-home
• sold: 0
• started: April 4, 2026
• quantity: 1
• availability: In Stock

payments ribicycl:

• credit card: Visa
• other
• wallet: Apple-pay

seller ribicycl:

• # reviews: 702
• city: Saint Petersburg, Florida
• rating: 100.0%

returns ribicycl:

• time: 30 Days
• method: Money back
• policy: Returns Accepted
• paid by: Seller

general ribicycl:

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

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