Key Features:A reliable long-lasting disc-compatible rear hub from a classic ATB groupset,Standard six-bolt fitting for Disc brake rotors, the perfect hub for Shimano Deore XT hydraulic Disc brake system,Double contact sealing shuts out mud and water from bearings to extend their service life and maintain smooth operation in all environments,Low-friction Borozon treatment bearing races for a precision rolling action,Light alloy quick release included,9 mm chrome-moly steel axle,Anodised aluminium hub shell,Available in 32 and 36 hole drillings,Average weight 244 grams (without Q/R).