Shimano LX M585 Disc Brake

"The new LX hydraulic disc brake brings the innovative technology that made the XTR and XT versions so great, to a whole new price range. A lightweight, rigid one-piece caliper gives you quick all-weather braking with less bulk. The Center Lock rotor and shimless caliper mounting simplifies installation, to get you on the trail faster with fewer hassles. Caliper Wt.: Front 183g/ Rear 188g Rotor Wt.: 160g (160mm) Center Lock rotor works w/ HB-M965, HB-M765 & HB-M585 hubs Fluid Type: Mineral Oil Compatible w/ both International Standard & Post-Type Fork Specify front or rear"