Shimano ST-R7170 Disc Brake Set/J-Kit DirectIt's Time To StopStopping is arguably more important than your ability to accelerate on your bike. With a good set of hydraulic disc brakes, you'll be able to descend with confidence. The Shimano ST-R7170 Disc Brake Set features Di2 electronic shifting for precise, intuitive gear changes to even more riders. The 105 BR-R7170 caliper features the Shimano Flat Mount System and its low-profile design that is ideal for road bikes. FeaturesReach adjustment and customized button functions allow you to dial in your ideal ergonomicsCreates a clean cockpit with a wireless connection and enhances the aesthetic of your bike while keeping shifting lightning fastEasily change button function with the E-TUBE app10% wide pad clearance that decreases the chance of disc brake rotor rubIncludes 2 CR1632 batteries that go inside the shifterManufacturer's part number: IR7170DRRDSC170A, IR7170DLF6SC100ASpecificationsLever MaterialAluminumCaliper MaterialAluminumRotor Size Compatibility-Adjustable Reach LeverYesBrake Caliper Mount TypeFlat MountHose Length (Front)1000mmHose Length (Rear)1700mmFluid TypeMineral OilPad CompoundResinNumber of Pistons2Rotor IncludedNoIntended UseRoad, GravelWeightN/A | Shimano | ST-R170 Disc Brake Set/J-kit Direct DISC BRAKE SET/J-kit DIRECT, 105 ST-R7170(L), BR-R7170(F)