The 20" wheels on Foresters wasa big thing in Australia for a while, plenty of pictures on Australian forums. Absolutely hideous, but to each his own. 18x7.5" with 225/45 tires works great on SG and looks very proportional.
There are som photos in my journal, "håkons 2.0xt"
They are 8,5x20 et35.
I am in the process of painting them, and just put new tires on (245/35r20)
So i havent ridden on it yet. But they fit just fine. And i think it looks awsome!