This Shimano 105 Di2 set pairs the left-hand ST-R7170 wireless shift/brake lever with a BR-R7170 flat-mount hydraulic front caliper, for 2x12-speed road bikes.

• Left-hand ST-R7170 Di2 dual control lever for 2x12-speed (front shifting)
• Wireless lever, powered by CR1632 coin cells; button functions set in the E-TUBE app
• BR-R7170 flat-mount hydraulic front caliper, mineral oil
• 1000mm hose
• Resin pads with finned backplate; 10% more pad clearance to reduce rotor rub
• One-way bleeding for easier service; rotor not included