No doubt itd look fookin stupid (i think 18s look too big on them) but i was just looking thru some old magazines and there was a wheel guide in an old Fast Ford (August 2000), a quote from the writeup...

Biggest weve ever seen on a road legal sierra so far is a monstrous 20in wheel

What cars that then? Seen 19s a couple of times, but never 20s.

Post a pic, i need a laugh