The shimano 4600 tiagra front hub 32h is a reliable front hub for road cyclists like those at the top of the range tiagra road hubs feature labyrinth and contact seals to prevent the ingress of corrosion causing dirt and water this along with the internal grease sleeve both increases durability and reduces service intervals the hub uses angular contact bearings designed to cradle the balls giving both radial and lateral support for superior strength and durability in real world riding condi