Hubs

Shimano's Ultegra Hubs are flag-bearers for high-durability, smooth-rolling performance. Hardened steel cup-and-cone design use stainless steel bearings for minimal drag and superior ease of maintenance. Shimano's Digital Adjustment System makes hub maintenance fast, simple, and reduces axial force on the bearings, reducing wear and tear on the hub internals.

DT Swiss Sinc Ceramic cartridge bearings. - The black dust cover is intended to be installed facing the hub and the tan seal is intended to face externally