The Shimano Deore HB-M525 Front Hub is a good value disc-compatible front hub with a standard six-bolt disc rotor fitting, ideal for Deore hydraulic and mechaanical disc brake systems. Low maintenance design includes single contact seals to keep out mud and water. Shimano Deore HB-M525 Front Hub Features Low-friction Borozon treatment bearing surfaces for smooth action and long bearing life Light alloy quick release included 9 mm steel axle Available in 32 and 36 hole drillings Average weight 245 g (without Q/R)