Again, side wall markings which are the same as published sizes are not often correct, one has to look at actual specs to get the true information needed to optimize tire and wheel widths.
I have ran hundreds of sets of wheels and tires, street, street/track and pure race cars up to having 18x13" wheels with 335 slicks and sometimes we have to pick what we can get that does the best for the given situation even though it might not be optimal it still might be the fastest way to go we have access to. One one car I had 285's on 9.5 wheels, far from what I would of wanted but due to rules and application it worked out the best but it was much harder to drive at the limit or even near it than if I had wider wheels or narrower tires.
On another car I had cantilever slicks that had around 10" of tread width on 7" wheels but the tires were specifically designed for it and they weighed a ton but were the fastest way to go so that is what the car had on it and they drove well all things considered.
Some tires have a bit stiffer sidewalls and work on a narrower wheels really well but will most often still be better with a bit more rim width.
The rule of thumb which nearly always gives the best feedback and control and on higher speed use faster and safer laps is to have a slight bit of stretch.
Some if not quite a bit of the sidewall support can be improved by running taller wheels and lower profile tires which was the case with the 285's on 9.5's and the 285 tires actual tread and section width were
more like a 265 tire. Going to a bit wider, smaller diameter wheel with a bit more sidewall could very well have made the car faster, easier to drive or both, likely so, if I could of found good wheels and the right tires in such diameter.
In the Miata world the best setups generally run 225 on 9, 245 on 10 and 275 on 11" wide wheels
All this is based on real world experience of my own and studying what real race cars and very competent street cars setup and ran by championship teams and drivers as well as a bit of easily understood physics.