how do i fit the ap1 s2000 rims on my acura rsx

my bad there 225 not 255

Please don't put wider rear tires on an RSX. If you need more grip anywhere, it's on the front, not the back. Also, 205 and 225 are tire widths, not rim widths, but if the tires on the rims are those sizes, then they should fit fine. You'll need to know the offset of the rims though to decide if you need any spacers to keep alignment correct.

For real dont stagger on that car. If they are 7 inch wheels go with 205s front and rear, if they are 8 run 215s. You may could do 225 with wheel arch modification if it will clear the suspension.