Shimano 105 BR-R7170 Road Hydraulic Disc Brake Caliper - Rear Flat Mount L03A Resin Pads with Fins. With proven hydraulic braking technology the Shimano 105 BR-R7170 caliper features the Shimano Flat Mount System and its low-profile design that is ideal for road bikes. More compact and lighter than ever the R7170 brakes offer wide pad clearance for easy wheel removal and quiet performance as well as one-way bleeding for easy clean maintenance.10% wider pad clearance decreases the chance of disc brake rotor rubMaintenance-friendly one way bleeding processIncludes L03A Resin pads with finned alloy backplate