The shimano 105 5800 front hub is a durable and smooth front 105 hub compatible with radial lacing the cubic boron nitride treated cone races provide a mirror smooth bearing surface for a low friction corrosion free performance and labyrinth and low friction contact sealing effectively shuts out water and dirt without affecting rotational smoothness internal o rings help maintain and increase service life of front hub by holding the grease in the bearing housing the hub shell is anodised col