Originally Posted by
BoraxKid
that's true at the cassette interface, but at the axle, the bearing cup takes up the same amount of room. So if you only remove enough spacers to go from 135mm to 130mm, you're going to have to spread the 126mm frame to make it work. I suppose their could be some nominal changes in the bearing cup thickness, but probably not 4 mm.
Spoken by someone that obviously hasn't done it before.
I have. Just the opposite direction.