Shimano SM-HB20 15/20mm Axle Hub Centerlock Rotor Lockring Fits all 150mm Thru-Axle, Shimano Centerlock front hubs OEM rotor lockring for XTR M9001/9011/9011-B, XT M8000/8010 Centerlock rear hubs, XTR WH-M9000/9020 wheel sets and XT WH-M8000/8020 front wheels Shimano Disc Rotor Parts