The shimano deore xt t780 rim brake rear hub is a high performance freehub rear hub xt is renowned for offering the best performance to value ratio super quick engaging freehub body with pawl engagement every 10 degree giving near instant power transfer double contact sealing with internal grease sleeve helps to keeps out water and dirt from bearings ensuring constant smoothness and longevity whilst keeping the grease in place borozon treated cup and cone bearing races provide precision low