I have well over 13,000 miles on my Rover with the SA 8 hub, and so far zero problems. My question is, if and when it actually dies, I have heard that it is possible to order a new SA8, and when it arrives to swap the new internal gear assembly with the old one, so that the wheel will not have to be rebuilt with the new hub. Has anyone done this, and if so, how difficult a swap was it? I have done all kinds of bike repairs for many decades, so I am fairly mechanically capable. Just don't want to bite off more than I can chew.