Shimano ultegra 6800 front road wheelthe 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 ultegra wheels offer proven technology based on the top of the range dura ace models features ust tubeless and tubed tyre compatible rim built with 16 stainless steel bladed and butted spokes labyrinth and contact seali