Shimano xtr cutting edge braking technology lightweight and powerful easily adaptable post style hydraulic disc brake calliper oversized 22mm glass fibre phenolic pistons optimized for heat insulation lightweight and stiffness opposed 2 piston design reduces leading effect and optimal pad wear increases braking control super lightweight mono body uses a forged one piece design that increases rigidity and reduces weight can be used with a choice of adapters and rotors giving you the f