The slx m7000 centre lock qr rear hub from shimano is a durable rear hub designed for use with centre lock disc brakes or rim brakes centre lock disc brakes allow for a secure and hassle free set up the freehub features a pawl design that means you have engagement every 10 degrees resulting in near instant power transfer the double contact sealing and internal grease sleeve makes sure that water and grit is kept out and the grease is kept in meaning your hub will run smoother for longer as