Hey FuNwaGoN, I'm sorry if I come off as pompous or stuck up...I assure you, that is not my intention. I'm not talking down to you or "jumping up and down" over everything you've said. I just want to set the facts straight for the people out there who do not know as much as you or me. I believe that you are very competant when it come to cars but not every one knows everything (including me) so it's always important when someone if giving out incorrect information that someone else corrects them.
One of the big misunderstandings about rubbing is that 18s are more likely to rub than 17s which are more likely to rub than 16s. I just want everyone out there to know that this is NOT true. As long as the overall diameter of the tire and width of the tire is kept the same, there is no differece in terms of risk of rubbing whether you go 16, 17, 18, 19 or 20. That is to say that as you step up in diameter of your wheel, you need to shorten the sidewall of the tire accordingly; when going from a 17 to an 18 inch wheel, you are increasing the diameter one whole inch, therefore you need to shorten the diameter of the tire one whole inch while keeping the same width. That being said, you can definitly fit 18 or even 19s on a 3rd gen protege with absolutly no rubbing problems. Ask Rishie from ARD he has 18s on his protege 5 with no problem and Sean from ARD has 19s on his MP3 with no rubbing issues. Again, it all comes down to offset. Now you are right, 20s will not fit on a protege because they do not make a tire thin enough to work..but theoretically, if they did, you can definitly fit 20s on a protege. After looking at all avalible tires, it looks like the biggest wheels we can fit on a protege would be a 19 inch with a 215/35/19 tire....now would I ever do this? Not in a million years...I personally think it looks rediculus but if someone wanted to, they'd be able to use this tire size on a 19x7.5 inch +50 offset wheel and have absolutly no rubbing problems. Again, I'm not trying to flame you FuNwaGoN, or be an ass about it. I just want everyone out there to have the correct info.
Shawn