Shimano Deore HB-M618/ M615/ M590/ M525A Front HubsDouble contact sealingSuper polished bearing races for low friction rolling6-bolt ISO disc mounting surfaceItem SpecificationsColorBlackWeight304Hub Drilling36Defined ColorBlackFront AxleQR x 100mmHub/Brake Compatibility6-Bolt DiscCenter to Flange, Left22Center to Flange, Right33Flange Diameter, Left61Flange Diameter, Right61