Without a doubt the one size smaller tire on a rim 1/2 inch narrower will result in lighter steering---but by how much, is the question. It certainly will not be as light as the 4" rims w/165 tires. You can lighten it up by dialing in as little caster as possible but that will sacrifice straight ahead stability. I ran 185/70/14 Michelins on mid 1960's Mustang GT (14x6) rims on my 1964 122 wagon for years. I never felt that was too heavy - but now, 40 years later, my arms might disagree. I have seriously thought about adding p/s to my 144S which, relatively, has a bit of caster and some negative camber for track use - but that makes it very heavy on the street. A friend has offered the parts for conversion. - Dave