Shimano Ultegra ST-R8170E Di2 Shift/Brake Lever with BR-R8170 Hydraulic Disc Brake Caliper – Left/Front 2x Flat Mount Black. Your time on the bike is precious let Shimano make it even better. Ultegra ST-R8170 brake levers bring enhanced modulation and control to every ride by employing Shimanos proven SERVO-WAVE technology. The Di2 platform untethers the shifters while delivering fast and reliable wireless shifting. The BR-R8170 hydraulic 2-piston disc brake caliper brings a new level of control to the road cycling world with improved modulation and a quicker initial braking point. Despite its smaller construction the system is quieter than ever and easier to maintain.

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