There are articles about this if you search on Google. There are also a few forum threads.
I imagine the tire width could maybe increase up to 2mm if you're increasing the rim width by 5mm.
The height, don't know, I think it depends on the circular cross section of the tire. I would guess that the height may decreased a little bit, but it could also increase. You could also cut some notches into your fenders, so that they can get around the fork welds and sit further up and away from the tire for more clearance.
Last edited by tomtomtom123; 01-15-20 at 02:36 PM.