The Shimano 7900 front hub features an updated design from the 7800 series with an easy - no-tool "digital click" bearing adjustment nut. No need to mess with perfection so, all else stays the same. Fully serviceable, if you ever need to service it - anyone who has opened up a Dura-Ace hub has likely found the grease good as new because the labyrinth seals are so effective. The hub has an oversize aluminum axle for stiffness and light weight. Includes the best skewer in the world. Fit, finish and quality of every part that makes this hub is perfect Dura-Ace quality.