Even 14's are not oem.
I have experience with different profiles like 195/45R16 (worse one) , 205/45R16, 195/55R15 (best one) , 185/60R15, 205/45R17 etc others are 13's.
If you don't believe me drive 185/65R14, 185/60R15 and 195/55R15. You will hardly feel differece between them.