I am soon to need tire replacement on my car. Currently I have 195/60 15 on it. I am contemplating 205/55 15 or 215/55 15. Quick calculations tell me the 205's ar 10mm shorter and 215's are 2.5mm taller. Any ideas?......also will they fit my stock rims? they are 15 X 6.5 I believe...Or should I not screw with things and stay stock till I upgrade (who know's when) to 16 inch???