The xt m8000 9mm qr front hub from shimano is a performance front hub for use with disc and rim brakes using centre lock mounting system the benefit of the centre lock disc brake system is that the braking is much more secure and the set up is hassle free the hub uses double contact seals with internal grease sleeve to keep the elements out and the grease in extending service life and maintain smooth operations even in the toughest terrain the hub runs using angular contact bearings which