The Shimano BR-R317 Rear Road Disc Brake Caliper give you disc brake power for road or cyclo cross bikes without the fuss of hydraulic fluid systems. The cable operated mechanical disc brake design means that you can upgrade to discs using existing compatible road brake levers or STIs. The super lightweight low profile body uses a forged one piece alloy design that increases rigidity, reduces weight and are easy to set up with adjustable pad clearance. With a long arm design that maximises performance for light braking control with New Super SLR brake levers. The post type caliper can be adapted to International standard mount frames and forks with various rotor sizes.