The shimano xtr m987 post type hydraulic disc brake caliper uses cutting edge braking technology is lightweight powerful and easily adaptable post style hydraulic disc brake caliper the caliper is made from super lightweight magnesium caliper design with titanium hardware with oversized 22mm ceramic pistons optimized for heat insulation lightweight and stiffness the opposed 2 piston design reduces leading effect and optimal pad wear increases braking control you can use ice tech pads with t