The Shimano 105 ST-R7170 Di2 Shifter with BR-R7170 Disc Brake Set combines cutting-edge electronic shifting with proven hydraulic braking technology. Designed for performance and reliability, this lever/caliper combo offers a premium experience for road cyclists. Semi-Wireless Di2 Shifting: The ST-R7170 shifters feature Shimano’s semi-wireless Di2 technology, delivering precise and intuitive electronic shifting. Equipped with a proprietary integrated circuit, the system ensures high security, fast processing speeds, and low power consumption, keeping you connected and efficient on the road. Customizable Ergonomics: With reach adjustment and programmable button functions, the ST-R7170 shifters allow you to customize your setup for maximum comfort and control. Whether you're tackling long rides or sprinting for the finish line, these features ensure an ergonomic fit tailored to your preferences. Compact and Quiet Hydraulic Brakes: The BR-R7170 calipers utilize Shimano’s reliable Flat Mount System for a sleek and lightweight design. Offering wide pad clearance for quiet braking and easy wheel removal, they ensure smooth and consistent stopping power. One-way bleeding simplifies maintenance, keeping your setup clean and hassle-free. With the Shimano 105 ST-R7170 Di2 Shifter and BR-R7170 Disc Brake Set, advanced electronic shifting and hydraulic braking technology are now more accessible than ever.