SHIMANO VA005804 Ultegra Road Bike Disc Brake Caliper Flat Rear BR-R8170 Mount Front/rear/set

( Brand: Shimano ), ( Manufacturer Part Number: VA005804 ), ( Color: Black ), ( Set Includes: Caliper, Brake Set ), ( Type: Disc Brakes Hydraulic ), ( Brake Type: Disc Brake ), ( Mount Type: Flat Mount ), ( Compatible Bike Type: Road Bike, Cyclocross Bike ), ( Country Of Origin: Japan ), ( Part Type: Disc Brake Caliper )

Review SHIMANO Ultegra Road Bike Disc Brake Caliper Flat Mount Front/rear/set

The **Shimano ULTEGRA BR-R8170 Road Disc Brake Caliper (Flat Mount, Front/Set)** represents the pinnacle of precision engineering and performance in modern road cycling, offering an unparalleled blend of braking power, modulation, and reliability for riders demanding the best in both on-road and gravel adventures. Designed as part of Shimano s high-end ULTEGRA drivetrain ecosystem, this disc brake caliper is engineered to deliver consistent, progressive stopping power across a wide range of conditions, from spirited descents on winding mountain roads to technical off-camber sections on gravel or light trail riding. The **flat-mount** design ensures seamless integration with contemporary road and gravel frames, providing a clean, streamlined aesthetic while maintaining optimal mechanical efficiency. Crafted from high-grade aluminum alloy, the caliper features a robust yet lightweight construction that resists flex under heavy braking loads, ensuring stability and repeatable performance even during aggressive downhill maneuvers or emergency stops.

At the heart of the BR-R8170 s performance lies Shimano s **dual-piston hydraulic braking system**, which delivers superior modulation and heat dissipation compared to mechanical or single-piston alternatives. The **dual pistons** work in tandem to clamp the rotor evenly, reducing lateral drag and improving efficiency, while the **high-performance brake pads** optimized for both wet and dry conditions offer extended wear life and consistent grip across varying temperatures. The **Shimano s exclusive brake fluid (Dura Ace or ULTEGRA-compatible)** ensures minimal bleed frequency and reliable operation over thousands of miles, reducing maintenance demands for riders who prioritize performance without compromise. The **adjustable pad height and rotor centering** allow for precise tuning to match individual preferences or frame geometry, while the **durable rubber seals and dust caps** protect the hydraulic system from debris, ensuring longevity and dependability in dusty or muddy environments.

Beyond its technical prowess, the BR-R8170 exudes a refined, sporty presence with its **sleek black finish and minimalist design**, complementing the aggressive yet aerodynamic lines of modern road and gravel bikes. Shimano s attention to detail extends to the **ergonomic brake lever integration**, which pairs seamlessly with compatible ULTEGRA or Dura Ace shifters to provide a cohesive, premium riding experience. Whether paired with a carbon or aluminum frame, this caliper set available in **front and rear configurations** offers riders the confidence to tackle demanding routes with authority, knowing that their braking system is engineered to perform at the highest level. For cyclists who refuse to compromise on safety, responsiveness, or build quality, the **Shimano ULTEGRA BR-R8170 disc brake caliper** stands as a testament to Shimano s legacy of innovation, delivering a braking solution that elevates both performance and peace of mind.

The **Shimano Ultegra BR-R8170** is a high-end road bike caliper disc brake set, designed for performance-oriented riders who demand precision, modulation, and reliability. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Shimano Ultegra BR-R8170**

1. **Superior Braking Performance**

The BR-R8170 is engineered for exceptional stopping power, with a larger rotor capacity (160mm front, 140mm rear) and optimized pad compounds for better heat dissipation and durability. This makes it ideal for aggressive riding, downhill sections, or high-speed descents.

2. **Precise Modulation and Control**

Shimano s hydraulic system delivers consistent, progressive braking with minimal fade, even under heavy use. The lever design allows for fine-tuned pressure application, reducing the risk of wheel lock-up or sudden stops.

3. **Lightweight Construction**

The calipers are built with aluminum and carbon components where applicable, keeping the overall weight low without compromising strength. This contributes to better handling and efficiency, especially on climbs or long rides.

4. **Compatibility with Road and Gravel Bikes**

The flat-mount design (with a 100mm drop-out spacing) makes it versatile for road bikes, gravel bikes, and even some endurance-oriented setups. It can be paired with standard road wheels without modification.

5. **Durability and Reliability**

Shimano s Ultegra components are known for their robustness, with fewer issues related to leaks or seal failures compared to lower-tier hydraulic systems. The BR-R8170 is built to last, even under demanding conditions.

6. **Integration with Shimano Groupsets**

If you re already using a Shimano Ultegra or Dura-Ace drivetrain, the braking system integrates seamlessly with the rest of the components, ensuring consistent performance and ease of maintenance.

7. **Aesthetic Appeal**

The sleek, minimalist design of the Ultegra calipers adds a premium look to the bike, which is appealing for riders who value both performance and aesthetics.

8. **Wider Rotor Options**

Unlike some road-specific disc brake systems, the BR-R8170 supports larger rotors (up to 160mm front), which can be beneficial for riders who want extra stopping power without switching to a full mountain bike setup.

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### **Cons of the Shimano Ultegra BR-R8170**

1. **Higher Cost**

The BR-R8170 is significantly more expensive than rim brakes or even entry-level hydraulic disc brakes. For riders on a budget, this may be a major drawback, especially if they don t frequently need the extra stopping power.

2. **Maintenance Requirements**

Hydraulic disc brakes require regular maintenance, including bleeding the system to remove air, checking brake fluid levels, and inspecting seals and hoses. Neglecting maintenance can lead to spongy levers, reduced performance, or even brake failure.

3. **Weight Over Rim Brakes**

While the BR-R8170 is lightweight for a hydraulic disc brake, it is still heavier than rim brakes. For climbers or riders prioritizing weight savings, this could be a minor but noticeable difference.

4. **Limited Availability of Parts**

Compared to rim brakes, hydraulic disc brake components (e.g., rotors, pads, hoses) may be harder to find in some regions, and replacement parts can be more costly.

5. **Potential for Overkill**

For casual riders or those who rarely ride in demanding conditions (e.g., no aggressive descents or heavy loads), the BR-R8170 may offer more performance than needed, making it an unnecessary upgrade.

6. **Compatibility Issues with Some Wheels**

While the flat-mount design is versatile, some high-end carbon wheels may require specific spacers or adapters to ensure proper rotor alignment and clearance. Always check compatibility before purchasing.

7. **Learning Curve for New Users**

Riders transitioning from rim brakes to hydraulic discs may need time to adjust to the feel of the levers, especially in terms of modulation and stopping distance.

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### **Conclusion**

The **Shimano Ultegra BR-R8170** is one of the best hydraulic disc brake sets for road and gravel bikes, offering a perfect balance of performance, reliability, and integration with Shimano s ecosystem. It excels in scenarios where stopping power, modulation, and durability are critical such as racing, aggressive riding, or long descents. However, its higher cost, maintenance demands, and weight penalty may not justify the upgrade for casual riders or those who prioritize weight savings over braking performance.

If you re a serious rider who demands the best braking system available and can invest in proper maintenance, the BR-R8170 is an excellent choice. For riders who primarily use rim brakes or don t need the extra stopping power, it may be overkill.

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### **Recommendation**

- You ride aggressively, frequently descend at high speeds, or carry heavy loads.

- You already own or plan to use a Shimano Ultegra or Dura-Ace drivetrain for seamless integration.

- You prioritize braking performance, modulation, and durability over weight savings.

- You are willing to invest in maintenance to ensure long-term reliability.

- You are a casual rider who mostly uses rim brakes and doesn t need the extra stopping power.

- You are on a tight budget and can achieve similar performance with a lower-tier hydraulic disc brake (e.g., Shimano Deore or SLX).

- You dislike the added complexity of hydraulic systems or are unwilling to perform regular maintenance.

- You prioritize weight savings and plan to use rim brakes or lighter disc brake systems (e.g., Shimano MT200 for road use).

For riders who want a middle ground, consider the **Shimano Deore BR-MT200** or **SLX BR-MT800**, which offer hydraulic disc braking at a lower cost with decent performance. However, if you want the best of the best, the BR-R8170 is a top-tier choice.

Details:

Works perfectly and comes with brake pads Used, has sings of use from road debris.

part #: va005804 prices

• $43.79-$154.21

specifications ribicycl:

• brand: Shimano
• mpn: Va005804
• color: Black
• set includes: Caliper, Brake Set
• type: Disc Brakes Hydraulic
• brake type: Disc Brake
• mount type: Flat Mount
• compatible bike type: Road Bike, Cyclocross Bike
• country of origin: Japan
• part type: Disc Brake Caliper

offer ribicycl:

• quantity: 1
• started: February 8, 2026
• availability: In Stock
• sold: 0
• best offers: True
• options: Ship-to-home

returns ribicycl:

• policy: No Returns

shipping ribicycl:

• class: Standard
• cost: $8.72
• transit: 4-10 Days
• carrier: USPS
• service: USPS Ground Advantage
• type: Calculated

general ribicycl:

• condition: Used
• Cycling > Bicycle Components Parts > Brakes

payments ribicycl:

• other
• wallet: Google-pay
• credit card: Diners-club

seller ribicycl:

• city: Ashland, Massachusetts
• rating: 100.0%
• # reviews: 100

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