Lovely stuff, thanks all. If I go the 11 speed Shimano HG road hub route (the frame is 125mm) assume I'd need to fit a spacer to allow me to fit an MTB cassette?
That's not actually a thing, at least not on a 90s MTB. If it's 126mm (possible, but odd), you might as well get it cold set to 135mm rather than messing about.
Lovely stuff, thanks all. If I go the 11 speed Shimano HG road hub route (the frame is 125mm) assume I'd need to fit a spacer to allow me to fit an MTB cassette?