SHIMANO RD-6770-SS Ultegra Cage Rear Derailleur DI2

( Brand: Shimano ), ( Manufacturer Part Number: RD-6770-SS ), ( Part Type: Derailleur Short ), ( Color: Gray ), ( Derailleur Cage Length: Short Cage ), ( Material: Aluminum Alloy ), ( Mounting Type: Hanger ), ( Number Of Speeds: 10 Speed ), ( Set Includes: Derailleur )

Review SHIMANO Ultegra Short Cage Di2 Rear Derailleur Very Good

The **Shimano Ultegra RD-6770-SS Cage Di2 Rear Derailleur** represents the pinnacle of precision and performance in modern road cycling, engineered to deliver seamless shifting, unmatched durability, and a refined riding experience for discerning cyclists. This high-end component is a cornerstone of Shimano s Di2 electronic shifting system, offering the ultimate in speed, reliability, and integration with the rest of the Ultegra drivetrain. The RD-6770-SS features a sleek, aerodynamic cage design optimized for both efficiency and aerodynamics, with a lightweight yet robust construction that ensures it remains a trusted companion on grueling climbs, high-speed descents, and everything in between. Its **SS (Super Smooth) shifting technology** is a hallmark of Ultegra, delivering ultra-responsive, near-instantaneous gear changes with minimal chain slap, even at the highest cadences or under heavy loads. The derailleur s **11-speed compatibility** ensures seamless integration with the RD-6770 crankset and other Ultegra components, providing a harmonious power transfer that maximizes efficiency and minimizes friction.

At the heart of the RD-6770-SS is Shimano s **Di2 electronic shifting system**, which eliminates the need for mechanical cables, replacing them with a wireless, battery-powered signal system that communicates directly with the shifters and crankset. This not only reduces weight and complexity but also eliminates common issues like cable stretch, friction, and misalignment, resulting in a shifting experience that is both precise and effortless. The derailleur s **Hollowtech II axle compatibility** ensures a clean, streamlined fit on modern road frames, while its **durable steel construction** reinforced with high-strength materials guarantees longevity even under the most demanding conditions. The **cage design** is meticulously engineered to minimize chain slap while maintaining optimal chain line, reducing noise and improving overall drivetrain efficiency. Additionally, the **quick-release mechanism** allows for swift and secure installation, making maintenance and adjustments a breeze.

For riders who demand the best, the RD-6770-SS is more than just a derailleur it s a testament to Shimano s commitment to innovation and performance. Whether tackling a grueling century ride, competing in a time trial, or simply enjoying a leisurely weekend tour, this derailleur ensures that every shift is smooth, every gear change is instant, and every pedal stroke is optimized for maximum power transfer. Its seamless integration with the Di2 ecosystem further enhances its appeal, offering riders the ability to fine-tune their shifting parameters via the **Ergo No.2 Di2 shifters** or the **Shimano e-Tube app**, allowing for personalized adjustments that adapt to riding style and terrain. With its blend of cutting-edge technology, refined engineering, and unwavering reliability, the **Shimano Ultegra RD-6770-SS Cage Di2 Rear Derailleur** is an indispensable component for those who refuse to compromise on performance.

The **Shimano RD-R6770-SS Ultegra Cage Di2 Rear Derailleur** is a mid-range electronic derailleur designed for road bikes, 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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### **Pros**

1. **Electronic Shifting (Di2)**

- Smooth, precise, and consistent shifting with no cable drag or friction, which is particularly beneficial in wet or dirty conditions.

- Adjustable shift feel (light, medium, or heavy) via the Di2 software, allowing customization to rider preference.

- Quick and easy adjustments no need to fine-tune cable tension or limit screws.

2. **Ultegra-Level Performance**

- Built with materials and components similar to higher-end Ultegra models, including a durable aluminum cage and a robust shift mechanism.

- Compatible with 11-speed groupsets, offering a wide range of gearing options for climbing and sprinting.

- Lightweight design, contributing to overall bike agility.

3. **Reliability and Durability**

- Di2 systems are known for their longevity, especially when maintained properly. The R6770 is a proven model with fewer issues compared to older Di2 iterations.

- Shimano s reputation for durability in electronic components means fewer dropouts or malfunctions over time.

4. **Compatibility**

- Works seamlessly with other Di2 components (e.g., shifters, battery, cranksets) from Shimano s road lineup, including Ultegra, Dura-Ace, and even some higher-end models.

- Fits standard road bike frames and is compatible with most rear wheels and cassettes.

5. **Value for Money**

- Positioned as a mid-tier Di2 derailleur, it offers electronic shifting at a lower price point than top-tier models like Dura-Ace or higher-end Ultegra units.

- A good stepping stone for riders transitioning from mechanical shifting or lower-end electronic systems.

6. **Maintenance**

- Di2 systems require less frequent maintenance than mechanical derailleurs (no cable replacement or lubrication). The main upkeep involves occasional cleaning of the derailleur and battery checks.

- Shimano s Di2 tools and software make diagnostics and adjustments straightforward.

7. **Shift Quality**

- The R6770 provides crisp, predictable shifts with minimal chain drop, even under heavy load. This is crucial for aggressive riding or racing.

- The "Ultra Smooth" shifting characteristic of Ultegra groupsets is retained, enhancing the riding experience.

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### **Cons**

1. **Cost**

- While more affordable than Dura-Ace Di2, it is still significantly more expensive than mechanical derailleurs or lower-end electronic alternatives (e.g., Enigma or some entry-level Di2 models).

- The initial investment includes not only the derailleur but also the Di2 battery, shifters, and potentially a new crankset if upgrading from mechanical.

2. **Battery Dependency**

- Requires a separate Di2 battery (not included), which adds to the upfront cost and introduces a maintenance point. Batteries typically last 1 3 years depending on usage and charging habits.

- Battery life can be affected by extreme temperatures, frequent shifting, or poor charging habits. A dead battery mid-ride can be inconvenient.

3. **Weight**

- Electronic derailleurs are heavier than their mechanical counterparts. While the R6770 is lighter than some Di2 models, it still adds noticeable weight compared to a mechanical derailleur.

- For ultra-lightweight or racing applications, this may be a drawback.

4. **Complexity**

- Di2 systems are more complex than mechanical setups, requiring familiarity with Shimano s Di2 tools and software. Basic adjustments (e.g., derailleur indexing) may require a bike shop if the rider is unfamiliar.

- Troubleshooting issues (e.g., shifting errors, connectivity problems) can be more involved than with mechanical derailleurs.

5. **Compatibility Limitations**

- Not all Di2 components are fully compatible across Shimano s lineup. For example, some older Di2 cranks or shifters may not work seamlessly with the R6770, requiring careful selection of parts.

- If upgrading from a non-Shimano electronic system (e.g., SRAM eTap), a full groupset change may be necessary.

6. **Resale Value**

- Di2 components, especially older models, may depreciate faster than mechanical groupsets. The R6770 is not a high-end model, so resale value may not justify the initial cost for some riders.

7. **Potential for Issues**

- While reliable, Di2 systems can experience occasional software glitches, connectivity problems, or sensor failures. These are usually fixable but can be frustrating if they occur at inopportune times.

- The R6770 is not immune to wear and tear; over time, the pulleys or shift mechanism may require replacement, though this is less common than with mechanical derailleurs.

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### **Conclusion**

The **Shimano RD-R6770-SS Ultegra Cage Di2 Rear Derailleur** is an excellent choice for riders who want the benefits of electronic shifting without the premium price tag of a Dura-Ace system. It strikes a balance between performance, reliability, and affordability, making it ideal for:

- Riders transitioning from mechanical shifting to electronic.

- Cyclists who prioritize smooth, precise shifting and want to avoid the hassles of cable maintenance.

- Those who value Ultegra-level components but don t need the highest-end features.

- Commuters or recreational riders who benefit from consistent shifting in various conditions.

- Riders on a tight budget who cannot justify the cost of a full Di2 system.

- Ultra-lightweight or racing-focused cyclists who prioritize minimal weight.

- Those who prefer the simplicity and lower maintenance of mechanical derailleurs.

- Riders who may not have access to Di2 tools or technical support for troubleshooting.

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### **Recommendation**

1. Are ready to invest in a full Di2 system (including battery, shifters, and potentially a crankset) and want a reliable mid-range electronic derailleur.

2. Value smooth, consistent shifting and are willing to pay a premium over mechanical options.

3. Plan to use the bike for varied conditions (e.g., commuting, training, light racing) where electronic shifting provides a noticeable advantage.

- You are upgrading from a mechanical groupset and want to experience Di2 without the Dura-Ace price.

- You prioritize shift quality and reliability over weight savings.

- You are comfortable with the maintenance and occasional upfront cost of a Di2 system.

- You are on a strict budget and can opt for a mechanical derailleur or a lower-end Di2 model (e.g., Enigma or older Ultegra Di2).

- You prefer the simplicity and lower cost of mechanical components.

- You are primarily a casual rider who doesn t need electronic shifting for performance gains.

For most riders who want a high-quality, mid-range electronic derailleur, the **R6770 is a solid and well-supported choice**. Pair it with a compatible Di2 battery (e.g., ST-R6700) and shifters (e.g., SL-R6700) for a cohesive setup. If you anticipate heavy use or extreme conditions, consider pairing it with a higher-end crankset (e.g., Ultegra or Dura-Ace) for added durability.

Details:

N/A Used Not new; definitely used; working, but only evaluated at a generic level. The electronic shift mechanism provides crisp, consistent gear changes without the need for cable adjustments, simplifying both installation and maintenance. Detailed s: Every product is accompanied by an individual outlining its unique features, specifications, and any noted imperfections. #Road #Di2 #Electronic Shifting #10 Speed #Short Cage The Shimano Ultegra RD-6770-SS is a short cage rear derailleur for electronic shifting Di2 systems, suitable 10-speed road drive trains.

This derailleur is designed to work with Shimano 10-speed cassettes up 28 teeth, making it a solid choice for both compact and traditional road double setups. We currently have the following examples of this item in stock. We evaluate each component based on the factors that matter most for part type. Real-world benefits include reliable shifting in varied conditions and the ability to fine-tune via electronic micro-adjustments, which can be easily accessed by pressing adjustment button on battery module.

Pulley wheels spin smoothly. The hanger mounting type ensures a secure fit on most road frames. Shimano Ultegra RD-6770-SS Short Cage Di2 Rear Derailleur VERY GOOD > Equip your training with Would've today. Shimano Ultegra RD-6770-SS Short Cage Di2 Rear Derailleur VERY GOOD In very nice shape overall, with a few small marks.

Browse the selections above or view items below. Updated to latest firmware. It is constructed from high-tolerance, cold-forged aluminum alloy, ensuring durability and precise operation.

part #: rd6770 prices

• $19.25-$165.00

specifications ribicycl:

• brand: Shimano
• mpn: Rd-6770-ss
• part type: Derailleur Short
• color: Gray
• derailleur cage length: Short Cage
• material: Aluminum Alloy
• mounting type: Hanger
• number of speeds: 10 Speed
• set includes: Derailleur

shipping ribicycl:

• carrier: USPS
• cost: $0.00
• type: Fixed
• service: USPS Ground Advantage
• transit: 5-11 Days
• class: Standard

seller ribicycl:

• # reviews: 613
• rating: 100.0%
• city: Saint Petersburg, Florida

general ribicycl:

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

payments ribicycl:

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

returns ribicycl:

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

offer ribicycl:

• started: March 5, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0

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