Shimano, Ultegra Di2 ST-R8170 / BR-R8170, Hydraulic Road Disc Brake, Rear, Flat Mount

The ULTEGRA ST-R8170 Dual Control 2x12-speed shifters with wireless Di2 connectivity feature a sleek design and easy adjustment, while the redesigned ergonomics provide a whole new level of comfort and control.

• Dual Control levers have a longer reach for greater safety and improved control
• Improved handles featuring refined ergonomics, better aerodynamics, and easier access to the control buttons
• SERVO WAVE Technology: Faster initial braking response and a wider modulation range
• Easy installation thanks to the J-Kit system, which comes pre-purged
• SM-BH90 hose included (1,000 mm front, 1,700 mm rear) ULTEGRA BR-8170 hydraulic brake caliper
• The most compact caliper to date
• Monocoque Construction: Rigidity and Lightweight Design
• ONE WAY BLEEDING: Clean and Easy Bleeding withCare
• Brake pad clearance increased by 10%, reducing the likelihood of disc rubbing