Given the jump to 11-speed for Ultegra, and the associated change in freehub design, Shimano had to produce a new pair of Ultegra-level wheels and the WH-6800s are the result. They have an all-alloy construction with 16 bladed spokes at the front and 20 at the back; they're radially laced on the front wheel and straight pull with a two-cross pattern to the rear