The shimano deore m525 6 bolt front hub is a good value disc compatible front hub with a standard six bolt disc rotor fitting ideal for deore hydraulic and mechanical disc brake systems 9 mm steel axle 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 available in 32 and 36 hole drillings average weight 245 g without qr