The Shimano Deore FH-M525 6 Bolt Disc Freehub is a good value disc compatible rear hub with a standard six bolt disc rotor fitting, iddeal for Deore hydraulic or mechanical disc brake systems. Shimano Deore FH-M525 6 Bolt Disc Freehub Features Low maintenance design includes single contact seals to keep out mud and water Low-friction Borozon treatment bearing surfaces for smooth action and long bearing life Light alloy quick release included 8- and 9-speed compatible Anodised aluminium hub shell Available in 32 and 36 hole drillings Average weight 449 grams (without Q/R)