a good value disc-compatible front hub standard six-bolt disc rotor fitting – ideal for Deore hydraulic and Mechanical Disc brake systems low maintenance design includes single contact seals to keep out mud and water low-friction borazon 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).