Shimano r517 mechanical disc brake caliperdisc brake power for road or cyclo cross bikes without the fuss of hydraulic fluid systems independently adjustable right and left pad clearance for perfect set up features caliper only low profile compact design dual adjustable pad clearance brake type mechanical disc brakes corresponding brake lever st 46005700 bl 4600r780 sold separately material aluminum construction one piece caliper design mount post type cablehydraulic cable finish