Shimano Sora HB-RS300 Front Hub

Like those at the top-of-the-range, Sora 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 increase durability and reduce 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 conditions; they also offer precision bearing adjustment and easy maintenance.