if your going to do 15x7 wheel then you should go with a 195/50/15,195/55/15 or 205/50/15... if your going to do a 15x8 wheel then you need to do a 195/45/15...
if you want a idea of what 195/45's look like on a 15x8 wheel here you go

Fs/Ft: Sportmax 501's 15x8 +15offset