Smaller SW then OE will make harder to steer, more so at low speeds, backing up or parking.
Can be easier to get ripped out of your hand(s) hitting a pothole etc too.
Smaller you get the bigger problems.
350 is ~13.8
320 is ~12.6
Difference is ~1.2" diameter so could be noticeable for extra effort needed to many but others won't care.
I had 11" SW many years ago and very hard to park but Not nearly as bad as 10" or 8" SW. (Those are illegal in some places.)
------------------Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)The Ogre's Fiero Cave
[This message has been edited by theogre (edited 06-18-2018).]