If your going to lower it you will need 235/35/18 for front you will scrape with 40s in my opinion. For rear you will want 245s on a 9.5 inch rim a 10 inch rim will overhang too much. Mind you real 9.5 inches actually measure 10.5 if your measuring rim distance. I would think 265 should be flush with edge of wheel and still may not work without coil overs or a spacer on rear as would bulge as much on the inside. Depends if that wheel is really a 10 inch which is massive i would think you will need a wide body.
I have 19's and car is lowered 1.7 inches i have flared guards i will use 235/35/19 no spacers on front may need to raise the front. and 295/30/19 rear. For a test fit i bought some used 245/40/19 they bolt on but wont be able to drive it with these so going for 235/35's up front i presently have 275/35/19 but have plenty of room on my rear with my spacer and will go lower wider for looks 295/30/19.
I still have the same levels to work off under my guards as a stock fiero so if it isn't going to work for me i will just tell you what won't work for me.
I dont have the rota wheels just a +35 offset.
[This message has been edited by Australian (edited 06-07-2010).]