Shimano deore m525 6 bolt rear hub is a good value disc compatible rear hub with standard six bolt disc rotor fitting ideal for deore hydraulic and mechanical disc brake systems anodised aluminium hub shell 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 available in 32 and 36 hole drillings average weight 449