Shimano Deore FH-MT401-B rear hub for 12-speed disc brakes with 141 mm outer diameter.Simple configuration and reliable mountain performance.Easy installation of brake disc thanks to splined bracket and locking ring.Clearance-type axle rapide.Labyrinth and contact seals.Allows greater maneuverability and more aggressive cycling.Smaller groove diameter than the large 10D chainring.Axle mounting method - QR.12 rear speeds.Hub width: 141 mm.Distance between flanges: 61.6 mm.Adjustment: 6.6 mm.P.C.D. left/right: 60/61 mm.Left/right flange diameter: 68.8/69.8 mm.Coupling type : Ratchet.Gasket/ring: Labyrinth and contact.FREEHUB body seal ring: Contact.MICROSPLINE