Shimano XTR BR-M9000 Disc Brake Caliper Being able to comfortably descend fast and technical terrain requires complete confidence in your equipment. At high speeds, nothing instills more confidence than knowing your brakes are ready and able to deliver unparalleled control and reliability in any situation. Shimano XTR brakes are arguably the best performing hydraulic disc brakes on the market. To provide high-powered braking performance with no compromise, Shimano introduces the new wave of XTR Race M9000 hydraulic disc brakes. The caliperis constructed of magnesium to provide XTR braking performance in a lightweight, race-ready package. Shimano was the first in the industry with full ceramic caliper pistons, but that's not all that set XTR braking performance apart from the rest. The XTR M9000 brakes also feature a newly redesigned insulated pistons that shed performance-sapping heat, allowing the XTR M9000 brakes to maintain cool, quiet performance under extreme braking. Shimano XTR M900 Caliper The magnesium M9000 caliper delivers powerful yet lighweight performance that resists heat better than ever thanks to an industry-first full-ceramic piston. Features Uses Shimano Mineral Oil for low environmental impact and easy handling. Compatible with finned brake pads for extra head dissipation. 74mm Post mount calipers Weight: 182g/wheel avg | Shimano XTR BR-M9000 Disc Brake Caliper Silver, Front or Rear