Shimano slx m675 disc brake caliperhigh performance hydraulic disc brake for efficient braking in all conditions features front or rear wheel use for international standard or post mount with adapters not included oversized 22mm ceramic 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 caliper