Shimano 105 -ST-R7120 Dual Control Levers feature a revised lever position and bracket shape developed using data from a broad study of different hand shapes. Shifting is quick and intuitive to provide cyclists what is expected from Shimano 105. That's combined with the all-condition confidence of a BR-R7170 flat mount hydraulic disc brake system ideal for road bikes.Mechanical dual control lever with updated ergonomics offers light shifting operation that lets cyclists focus on the road aheadBlade shape creates shorter lever access curve allowing riders with a wide range of hand sizes and shapes to comfortably reach their leversReach Adjust allows riders to customize their fitBR-R7170 flat mount caliper is compact and light10% wider pad clearance decreases the chance of disc brake rotor rub and provides clearance for easy wheel removalOne-way bleeding for easy and clean maintenanceIncludes L05A-RF resin pads with finned backplate that help reduce heat build up