The Shimano XT M785 I-Spec-B Disc Brake Lever is an ergonomic, powerful & compact Servo-Wave hydraulic disc brake lever that is performance optimized with full adjustability on the fly. With excellent clearance at the caliper has enabled Shimano to use a short stroke Servo-Wave mechanism. As the brake lever is pulled a cam linkage enables rapid pad to rotor engagement, at the point of contact the cam moves across multiplying the leverage ratio, quick pad engagement & increasing the stopping power for aggressive riding. The XT Disc Brake Lever is I-Spec-B compatible.