that's a Honda size?
Anyhow if you go by Toyo or Yokohama's chart it would be 235's. Stock FD rims are 8", don't know what the FC's are. You can put 235/45-16 on stock rims.
If you want them just for show, you can buy my chrome Utlra's 17x7.5 and run 225/40-17's but you are better off with 17x8.5's. Tire selection and price on 18's suck.