Shimano 105 front hub 5800the shimano 105 5800 front hub is durable and smooth making it the perfect choice for your next training wheel build features radial lacing compatiblecubic boron nitride treated cone races provide a mirror smooth bearing surface for a low friction corrosion free performancelabyrinth and low friction contact sealing effectively shuts out water and dirt without affecting rotational smoothnessinternal o rings help maintain and increase service life of front hub by holdin