R-Bones, I have no idea where you saw the 245/35/20s being smaller than the 235/50/17s... I say you need a tire size calculator.
Here, I found one for you:
http://www.miata.net/garage/tirecalc.html
Well, I even put the numbers in for you, I thought it might be hard for you to understand how it works.
Ok, stock 235/50/17 tire's overall diameter (height) is 26.3" and the 245/35/20 tire's overall diameter (height one more time) is 26.8". See any difference??
Which on is taller? 26.3" or 26.8"? (hint: the second one)
Oh yea and put that picture that you promised up too.
Ok my friend, the aftermarket wheels being 1" wider than the OEM wheels (20x8.5 vs 17x7.5), plus the offset around 40mm, which is a big jump from the stock 60mm offset give us a huge possibility of rubbing. So far you understood everything? Hope you did.
Also, as I said before, from higher speed and uneven surfaces the car's suspension compresses (physics) and the stickin out wheels with wide tires rub against the fender liner even if the car is not lowered. I don't know maybe you have 20"x7.5" wheels and your don't rub, but 90% LS that have 20" wheels over here use 20x8.5 and most of them rub. As I stated before the only 20" wheels that I can think of that don't rub in 20x8.5 size are Foose wheels that have offset higher than 40. I am not talkin about 275/30/20 tires on 20x10s wheels anymore, because that's out of question.
Oh, yea man and about the 13 y.o. girl that just started her period, you know I thought about it and you know I am a generous man and I work in a hospital, I rescue people, give me your address and I'll send you a box of tampons...
Now I'm R Bones? What a Grease Ball! The car rubs cause you have a problem, the first thing when pro shops that wont do any custom work to your car to make your wheels fit is make sure they are going to be the same overall diameter. So why the hell would these wheels rub and not the stock 17" set up stupid? Ill take some pics and show you the fact that my 17's that came on the damn car are bigger with the factory tires than my OD on my 20" wheels.
No but what does make you stupid is not admitting to the fact and understanding that this is the problem!
275 Tires? I had 245's maybe thats why they didn't rub, maybe I thought of the fact that in a stupid situation it might rub and might need some simple adjustments to make things work the right way. And again that tire will rub if the car is lowered I am pretty sure I made that point clear.
OK so lets all go out and buy 5,000$ suits to go play Rugby in. Its the same damn thing, why pay so much for nice wheels if your going to drive like a jack ass and ruin something? If you cant uderstand that some events might happen by accident and you need to be carefull again your stupid, sorry for beeing so blunt!
And your one to talk? Get real!
What luffs? I had 20x10 Luff D2's whan I started this forum and I sold them right after cause I couldnt pull the rear fenders ( Cause of the door beeing in the way ) so I could tuck them in after I dropped the car! Then I drove on my old 17's that came on the car (so I do have multiple experinces with the two different sizes before and after) and I noticed that they actualy felt worse than the others. Shortly after that I got my TSW Carlton's and now Im still in the process of repairing any scuffs and getting them painted.