i have a mazdaspeed protege sedan and just put on my rx8 wheels with 225/40/18 tires. no rubbing or anything without spacers, they just had to use different weights because the weights they were going to use would hit the strut.it certainly is close though. so if anyone is wondering you can run 225/40 on rx8 wheels aslong as ur not lowered too much, without spacers on the sedan. im going to roll my rear fenders though and put my 5mm spacers on anyway i was just surprised based on what i read about rx8 wheels on proteges.