Shimano SLX FH-M7130-B Rear 12 x 157mm Super Boost + Centerlock Disc Brake Hub, Microspline Freehub, 32h - The Shimano SLX FH-M7110/M7130 rear freehub features a Micro Spline freehub body and is centerlock disc compatible.Features Shimano's Quick Engagement technology which equips the hub with 18/16 notches and two sets of pawls to double the engagement and optimize traction for faster accelerationShimano's Centerlock system makes disc brake rotor installation easy with a spline mount and lock ringThe aluminum Micro Spline freehub body is lightweight and seamlessly integrates with small 10-tooth top gears