Shimano xt rear hub t780high performance rear freehub for rim brakes xt is renowned for offering the best performance to value ratio features 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 friction