Shimano slx m675 disc brakethe new slx servo wave hydraulic disc brake blbr m675 provide huge progress in braking control and heat management the new compact caliper with oversized one way bleeding 22mm ceramic pistons is combined with a lightweight lever the lever is lighter than the current version yet provides more brake power the center lock disc rotors 160 180 and 203mm have a three layer sandwich structure of an aluminum core embedded in stainless steel all the performance you n