Shimano Ultegra ST-R8170A Di2 Shift/Brake Lever with BR-R8170 Hydraulic Disc Brake Caliper - Right/Rear, 12-Speed, Flat Mount, Black Swim Brand_Zone3 View advanced training metrics that

View advanced training metrics that include running dynamics

Medium leg provides the perfect amount of coverage

The patented Airzone 2 Chamois is best suited for comfort and support for high miles and pavement or mixed surfaces

Compression rating 11-16

Advanced knob design creates extra gripping edges and reinforced side tread for secure cornering

Shimano Ultegra ST-R8170A Di2 Shift/Brake Lever with BR-R8170 Hydraulic Disc Brake Caliper - Right/Rear, 12-Speed, Flat Mount, Black Swim Brand_Zone3 View advanced training metrics thatYour 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 Shimano's 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