Originally Posted by
georges1
the CS 7800 will fit on dura ace 7400,ultegra 6400 and 105 SC 8 speed hubs as well as on a dura ace 7700, ultegra 6500 and 105 5500 9 speeds hubs and even on 11 speed hubs such as Shimano 105 5800,Ultegra 8000 and Dura Ace 9000 with a spacer.
Great! I was mostly worried about the freehub splines not being tall enough. Build is a go!