http://www.miata.net/garage/tirecalcold.html
use that to compare tire and wheels sizes
i used 2 inch drop spindles cause i already had them and i had to cut down the cups and trim the frame so it would lay flat frame on 225-40-18s plus new inner finder of course, but thats what i use on my 95 s10. Oh yeah and i didnt have to trim for the tie rods, but i do got to turn the bolts so that it clears the frame.