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 & water from bearings to extend their service life & 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 & 36 hole drillings Average weight 244 grams (without Q/R)