The Shimano Deore XT M8100 caliper features lightweight braking performance and reliable stopping power in all conditions High performance hydraulic disc brake for efficient braking in all conditions Front or rear wheel use for International Standard or Post mount with adapters (not included) Oversized 22mm phenolic pistons optimized for heat insulation, lightweight and stiffness Opposed 2-piston design reduces leading effect and optimal pad wear increases braking control Increased pad to rotor clearance reduces the chance of rotor drag in muddy conditions Forged calliper design is lightweight and rigid One way internal fluid circuit makes bleeding easy Mineral oil brake fluid is non-corrosive and less hazardous than conventional hydraulic brake fluid Shim-less mounting bracket allows for quick installation and setting up Recommended for use with Ice Tech Center Lock rotors for optimum braking performance Comes with G03A resin pads without fins