Originally Posted by
alcjphil
There were some 7800 hubs that had taller splines that will not allow the installation of anything but a 10 speed cassette. Other than that, there are no restrictions.
All
7800 had the tall splines and an Al cassette body.
If you want maximum 7,8,9,10 compatibility make sure to get a
7850 rear hub. They went to a Ti cassette body and back to a normal spline.
No 78xx will fit 11 speed though.