Shimano Saint M815 Cassette Hub - 12mm through axle compatible, standard size small diameter centerlock spline for Shimano's lighter weight rotors, included rotor lockring tightens with an external BB tool, angular contact bearings are highly durable, adjustable and rebuildable, labyrinth and lip seals keep it clean, stainless steel bearings, cubic boron nitride races, large shell diameter, 10 point quick engagement highly durable freehub body, 9 speed, 355g anodized black/gold, 32 hole, 12x150mm
