Shimano ST RS685 Hydraulic Disc 11 Speed ShiftBrake Levers and Calipers. If you're going to make the jump to disc brakes for your road or cyclocross bike, why not upgrade to a true revolution in braking performance with the Shimano ST RS685 Hydraulic Disc 11 Speed ShiftBrake Levers and Calipers. These 11 speed shiftbrake levers are Ultegra level in construction plus are compatible with all of Shimano's mechanical 11 speed road groups Dura Ace, Ultegra, and 105 so you can keep your derailleurs and only upgrade the shifters. The RS685 levers use an opposed 2 piston design and one way internal fluid circuit that improves performance, braking control, modulation, and make bleeding easy. The ergonomics are similar to Shimano's other current levers, with only a slightly enlarged bump to house the cylinder. The RS785 hydraulic disc brake calipers are specifically designed for use with road brake levers, with a tailored piston stroke and modulation. They can be used with either IS or post mounts with adapters, not included and feature oversized 22mm ceramic pistons that help manage the higher heat generated by the faster speeds achieved on the road. The pads are self centering, and the caliper has been designed to improve clearance with the rotor, decreasing the chances of rubbing.