John, if you’re doing new rims, years ago when I discovered some cracks in my 17” Boranni on my 235 Lodola, I couldn’t find another 17”, right away. So I took some measurements, installed an 18” on the rear and have never regretted it. Previously I was always tapping my toe on the gearshift looking for 5th gear, which, of course, doesn’t exist.. the 235 doesn’t suffer much on the bottom end and the extra top end is quite nice. I eventually found a 17”, which I will save for the next owner.
Mike
Boston