225/50/15 tires do fit on the 200SX :D

http://www.printroom.com/_vti_bin/ViewImage.dll?userid=blairellis&album_id=60257&image_id=2&courtesy=1


Comparison of 225/50/15 on 6.5" wheel and 205/45/16 on 7.5" wheel.
http://www.printroom.com/_vti_bin/ViewImage.dll?userid=blairellis&album_id=60257&image_id=1&courtesy=1

"Comparison of 225/50/15 on 6.5" wheel and 205/45/16 on 7.5" wheel."

so those 225s are on a 6.5" wide wheel, or do you have that reversed?

Nope the 225's are on Rota Circuit 8's that are 15*6.5 and the 205's are on OZ F1 plus that are 16*7.5.