Brand ashima weight 22g specification the ashima center lock has been designed to work with shimano center lock hubs with almost 0deg back lash resulting in smooth quite braking x25aa features precision broached spline allows 6 bolt rotors to fit shimano center lock hubs no need for rotor bolts extruded aluminum collar cncd aluminum shoulder pins steel carrier plate x25aa cncd aluminium locking radvantages min back lash extremely light