Durable and smooth 9, 10 and 11-speed compatible 105 rear hub Cubic Boron Nitride treated cone races provide a mirror-smooth bearing surface for low friction, corrosion-free performance Labyrinth and low-friction contact sealing effectively shuts out water and muck without affecting rotational smoothness Internal grease sleeve helps maintain and increase service life of hub by holding the grease in the bearing housing Anodised cold forged aluminium hub shell Comes complete with Q/R skewer 9, 10 and 11-speed compatible