Okey dokey. I'm not a car person so I haven't a clue about tyres. But I'd still think you shouldn't be putting smaller tyres than what the manufacturers recommend.Completely different thing.
Maybe I'm misisng something but what has that got to do with the profile?Why would you want to do this? To save money?
One thing I won't compromise on is tyres. It can be the difference between avoiding an accident and having one.