RS500 wheels offer proven technology based on the top of the range Dura-Ace models. Tubeless and tubed tyre compatible rim. Built with stainless steel blade and butted spokes, labyrinth and low-friction contact seals effectively shut out water, mud and dirt without affecting rotational smoothness. With a quick and easy to maintain digital click bearing adjustment. The Hub uses angular contact bearings designed to hold the ball bearings, 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.