You can use 205/50 but it wont matter. For some people the inner lip of the rim is what grinds not the tire. If you get wheel spacers Id recommend at least 3mm. A 5mm would work too but Id also recommend extended wheel studs. I dont use wheel spacers on my si rims and I grind the inner lip if I turn all the way. So I dont turn all the way. 3 point u turns own me. h: