...jimacuda- based on your earlier entry #20 (quotes attached) you should be able to tell if it is a 5 1/2 or 4 1/2 from the photo in entry #21... Can you see a visible lip where the wheel hoop and wheel center come together?
....I can. So you still think a wheel with a visible lip where the wheel and center meet is "obviously" a 5 1/2 wheel?
In fact- The wheels in the photo in entry #21 are 4 1/2 wheels- not 5 1/2
... So I suggest you check your advice before rattling off something that is not accurate and present it absolute terms like "of course" and "obviously"