Shimano 105 BR-7070 Disc Brakes: All-Condition Control

For cyclists who demand unwavering performance and supreme control, the Shimano 105 BR-R7070 disc brake set, seamlessly paired with the ST-R7020 Dual Control Levers, represents a significant leap forward in cycling technology. This meticulously engineered system, a cornerstone of Shimano's highly regarded 105 R7000 series, is designed to provide premium braking power and refined ergonomics across a multitude of cycling disciplines, including cyclocross, gravel riding, and traditional road cycling. It’s an integrated solution that promises enhanced safety, reliability, and an altogether more confident riding experience, regardless of the terrain or weather conditions you encounter.

At the heart of this system lies a sophisticated hydraulic design, offering a level of modulation and stopping force that mechanical brakes simply cannot match. The integration of advanced features such as Ice Technology for superior heat management, alongside the ergonomic brilliance of the ST-R7020 levers, ensures that riders can maintain precise control and comfort even during the most demanding descents or in challenging wet conditions. This article delves into the intricacies of the Shimano 105 BR-R7070 disc brake set, exploring its specifications, features, and the profound benefits it brings to the modern cyclist.

Understanding the Shimano 105 BR-R7070 Disc Brake Set

The Shimano 105 BR-R7070 disc brake set isn't just a collection of components; it's a finely tuned, group-integrated hydraulic braking system designed for optimal performance. The 'BR-R7070' refers specifically to the brake calipers, while the 'ST-R7020' denotes the integrated shift/brake levers. Together, they form a cohesive unit that delivers powerful, consistent, and easily modulated braking. This system distinguishes itself through its aerodynamic flat-mount calipers, which offer a sleek aesthetic and improved integration with modern bike frames, alongside cutting-edge heat dissipation technology. The primary application for this set spans cyclocross, gravel, and road cycling, making it a versatile choice for a wide array of riders.

Key Specifications at a Glance

To provide a clear overview, here are the fundamental specifications of the Shimano 105 BR-R7070 / ST-R7020 system:

The ST-R7020 Dual Control Levers: Your Command Centre

The ST-R7020 Dual Control Levers are arguably where the magic truly happens for the rider. These levers are the interface between you and your bike's braking and shifting systems, and Shimano has poured significant ergonomic and technological expertise into their design. They embody Shimano Total Integration (STI), a concept where braking and shifting functions are combined into a single, intuitive lever. This integration significantly enhances safety and efficiency, allowing riders to maintain a firm grip on the handlebars while simultaneously shifting gears and applying brakes.

A key enhancement in the ST-R7020 levers is the revised shift unit, engineered for faster and more intuitive shifting with noticeably less lever travel. This translates to quicker gear changes and reduced effort, which is particularly beneficial in competitive scenarios or during long rides where fatigue can set in. Furthermore, Shimano has addressed rider comfort with an extended reach adjustment of 15mm. This generous adjustment range allows cyclists of various hand sizes to fine-tune the lever position for optimal comfort and control, ensuring that the brakes are always within easy reach and feel natural to operate.

The internal hydraulic architecture of the ST-R7020 has been carefully re-engineered to provide a balanced ergonomic feel that is consistent whether you're accustomed to rim brakes or disc brakes. This means the transition to disc brakes feels seamless, without any awkwardness in lever feel or positioning. The levers themselves are constructed with a composite body, while the brake lever blade is crafted from durable aluminium, offering a perfect blend of lightweight performance and robust reliability. The integration of Optislick inner cables, featuring a minimal galvanic coating, further contributes to the system's efficiency by providing smoother cable routing and enhanced corrosion resistance, ensuring crisp shifting performance over time.

BR-R7070 Calipers: Precision Engineering for Stopping Power

The BR-R7070 brake calipers are the workhorses of the system, responsible for converting hydraulic pressure into formidable stopping power. These calipers feature a sleek, flat-mount design, which is the modern standard for road and gravel bikes. The flat-mount system offers a cleaner aesthetic and a more direct, robust connection to the frame and fork, reducing flex and improving braking efficiency. This design also contributes to the overall aerodynamic profile of your bike, seamlessly integrating the braking system without sacrificing performance.

A standout feature of the BR-R7070 calipers is the incorporation of Shimano's acclaimed Ice Technology. This innovative system is designed to manage and dissipate heat effectively, a critical factor for consistent braking performance, especially during prolonged descents or in demanding conditions. The calipers utilise resin pads with cooling fins, which significantly reduce heat build-up. By keeping the operating temperature lower, Ice Technology prevents brake fade, ensuring that the braking performance remains fully maintained and reliable, even when the going gets tough, such as during rain-soaked descents or extended periods of heavy braking. The calipers are also compatible with both organic (resin) and sintered (metallic) brake pads, offering riders the flexibility to choose based on their preference for modulation, noise, and durability.

Internally, the BR-R7070 calipers employ a two-piston design, with pistons made from ceramic material. Ceramic pistons are chosen for their excellent heat insulation properties, preventing heat transfer from the pads to the hydraulic fluid, which further enhances braking consistency and longevity. The two-piece construction of the aluminium caliper body ensures rigidity and precise engagement, contributing to the system's overall reliability and powerful braking force. The straight hose connection to the caliper also contributes to a cleaner routing and more efficient hydraulic performance.

Hydraulic System & One Way Bleeding: Keeping It Smooth

The hydraulic system of the Shimano 105 BR-R7070 relies on mineral oil for actuation, a choice made by Shimano for its stability, non-corrosive properties, and environmental friendliness compared to DOT fluids. The system is supplied with pre-cut SM-BH90-JK-SS brake hoses, measuring 1000mm for the front and 1700mm for the rear, providing ample length for most bike setups.

Maintenance of hydraulic brakes can sometimes be perceived as complex, but Shimano has significantly simplified the process with its One Way Bleeding technology. This technique, applied to the calipers, streamlines the brake bleeding procedure. The internal hose routing within the caliper is optimised to prevent air bubbles from becoming trapped, making it easier for air to exit the system during bleeding. In conjunction with the funnel-type bleed port (M7 funnel), the brake can be bled cleanly and efficiently, ensuring that your brakes remain free of air and perform optimally. While the system comes pre-filled and ready for initial installation, a full bleed is always recommended after fitting to ensure maximum performance and a consistent lever feel.

Compatibility: Will It Fit My Bike?

The Shimano 105 BR-R7070 / ST-R7020 system is designed to integrate seamlessly within the broader Shimano ecosystem, particularly with other components from the 105 R7000 series and higher-tier groupsets. This ensures that you can upgrade your braking system without necessarily overhauling your entire drivetrain, provided your existing components are compatible.

It's important to note that while the system is highly compatible with a range of Shimano 11-speed road components, always cross-reference with your specific component models to ensure full functionality. The recommended brake rotor for optimal performance with the BR-R7070 calipers is the SM-RT70, available in 140mm, 160mm, and 180mm sizes, allowing you to tailor your braking power to your riding style and terrain.

What's Included in the Box?

When you purchase the Shimano 105 BR-R7070 + ST-R7020 disc brake set, you typically receive a comprehensive package designed to get you up and running quickly. The standard contents include:

• 2 x Shimano 105 BR-R7070 brake calipers (front and rear)
• 2 x Shimano 105 ST-R7020 Dual Control Levers (front/left and rear/right)
• 1 x Shimano SM-BH90-JK-SS brake hose, 1000 mm (for the front brake)
• 1 x Shimano SM-BH90-JK-SS brake hose, 1700 mm (for the rear brake)
• 2 x pairs of Shimano brake pads (resin with cooling fins, pre-installed)
• 1 x disc brake adapter for front 140/160 mm and 160/180 mm rotors
• 2 x hose connection sets with olives and pins (for cutting hoses to custom lengths)
• 2 x Type A caliper bolts (for front caliper installation)
• 2 x caliper bolts for 25 mm frame diameters (for rear caliper installation)
• 1 x shift cable set with housing and end caps (for mechanical shifting)

The system arrives pre-filled with mineral oil, meaning the initial hydraulic fluid is already in the system. While this allows for a quicker initial setup, Shimano always recommends performing a full bleed after installation to ensure all air bubbles are removed and to achieve the best possible lever feel and braking performance.

Frequently Asked Questions (FAQs)

Q: What makes the Shimano 105 BR-R7070 system a premium choice for cyclists?

A: The Shimano 105 BR-R7070 system stands out due to its comprehensive approach to braking performance and rider experience. It combines powerful hydraulic braking with the refined ergonomics of the ST-R7020 Dual Control Levers, offering superior modulation and stopping power in all conditions. Key features like Ice Technology for consistent heat management, easy One Way Bleeding, and wide compatibility with other Shimano 11-speed components contribute to its premium status. It offers a significant upgrade in control, comfort, and safety over traditional rim brake systems or lower-tier disc brakes.

Q: Is the BR-R7070 suitable for all weather conditions?

A: Absolutely. The hydraulic nature of the BR-R7070 system, combined with its advanced features, makes it exceptionally well-suited for all weather conditions. Unlike rim brakes, disc brakes are far less affected by rain, mud, or grime, maintaining consistent stopping power. The integrated Ice Technology further enhances this by preventing heat build-up during long, wet descents, ensuring reliable and fade-free braking performance even when conditions are at their worst.

Q: How does 'One Way Bleeding' benefit me as a rider or mechanic?

A: 'One Way Bleeding' is a significant benefit for both professional mechanics and home enthusiasts. It simplifies the often-fiddly process of bleeding hydraulic brakes. By optimising the internal hose routing within the caliper, air bubbles are naturally guided upwards, making them easier to purge from the system. This means less time spent on maintenance, a cleaner bleeding process, and a more consistently firm and responsive brake lever feel, ensuring your brakes are always performing at their peak with minimal fuss.

Q: Can I use different brake pads with the BR-R7070 calipers?

A: Yes, the BR-R7070 calipers are versatile regarding brake pad compatibility. They come supplied with resin (organic) pads with cooling fins, which offer a good balance of modulation, quiet operation, and initial bite. However, the calipers are also compatible with sintered (metallic) brake pads that have a narrow pad shape. Sintered pads typically offer greater durability and better performance in wet or muddy conditions, though they can sometimes be noisier. Both standard and Ice Tech compatible pads can be used, allowing you to tailor your braking setup to your specific riding preferences and environmental conditions.

Q: What's the advantage of 'Flat Mount' calipers?

A: The 'Flat Mount' standard for disc brake calipers offers several advantages, particularly for road and gravel bikes. Aesthetically, it provides a much cleaner, more integrated look, as the caliper sits flush with the frame or fork, reducing its visual bulk. From a performance perspective, flat mount calipers offer a more direct and stiffer connection point to the frame, which minimises flex and enhances braking power and modulation. It also often allows for a lighter overall system compared to traditional post-mount setups that require additional adapters.

Q: What does 'Shimano Total Integration (STI)' mean for my riding?

A: 'Shimano Total Integration' (STI) refers to Shimano's design philosophy where the braking and gear shifting functions are combined into a single lever. For the rider, this means enhanced safety and control, as you can shift gears and apply brakes without having to move your hands from a secure grip on the handlebars. This is particularly advantageous when navigating challenging terrain, descending at speed, or in competitive situations where split-second decisions are crucial. It allows for a more fluid and intuitive interaction with your bike, improving overall riding efficiency and confidence.

In conclusion, the Shimano 105 BR-R7070 disc brake set with ST-R7020 Dual Control Levers is a highly refined and capable system that brings premium hydraulic disc braking to a wide audience. Its blend of powerful, consistent stopping force, ergonomic comfort, and robust construction makes it an excellent choice for anyone looking to enhance their cycling experience across road, gravel, and cyclocross disciplines. With its advanced features and ease of maintenance, it truly embodies Shimano's commitment to delivering reliable, high-performance components that allow cyclists to ride with greater confidence and enjoyment.

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