Rim brakes are great, but they have an unfortunate penchant for not working well when wet or when a squirrel runs right out in front of you, so we look to the Shimano RS785 Hydraulic Disc Brake Caliper for reliable, all-condition, fade-free stopping power. It teams up with Shimano's ST-RS685 11-speed components for added performance and features IceTech cooling fins designed to dissipate heat, increase braking response, and keep performance high even during long, steep descents.