Hydraulic disc brakes are coming to Shimano's mechanical road shifting systems, the company announced on Monday. The new shifters, dubbed ST-RS685, will be compatible with all of Shimano's 11-speed mechanical groups, and will pair up with a refined version of the R785 hydraulic disc caliper introduced last year, called BR-RS785.
The new RS685 shifters sit outside Shimano's branded groupsets — Dura-Ace, Ultegra, 105, etc. — just as the Di2-enabled R785 hydraulic shifters do, and feature subdued graphics and design intended to fit in well with any of Shimano's road groups.
The system retains the hydraulic disc brake technologies introduced with the R785 last year, including the use of 140mm ICE tech rotors and finned brake pads to improve cooling, and 10mm of brake lever reach adjust to help dial in fit.
The new hydraulic caliper will be compatible with the R785 Di2 levers, but gains small improvements via new inboard hose routing and a refined bleed nipple.
- High performance hydraulic road disc brake for efficient braking in all conditions
- Front or rear wheel use for International Standard or Post mount with adapters (not included)
- Oversized 22mm ceramic pistons optimized for heat insulation, lightweight and stiffness
- Opposed 2-piston design reduces leading effect and optimal pad wear increases braking control
- Increased pad to rotor clearance reduces the chance of rotor drag
- Forged caliper design is lightweight and rigid
- One way internal fluid circuit makes bleeding easy
- Mineral oil brake fluid is non-corrosive and less hazardous than conventional hydraulic brake fluid
- Shim-less mounting bracket allows for quick installation and setting up
- Recommended for usewith Ice Tech FREEZA Centre-Lock SM-RT99 rotors for optimum braking performance
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