Hi Bot.
You can buy a SFC 1000 proto type

Br Peder
That was even a 16" if my memory serves me well...
In theorie, a larger diameter brings more stability at higher speeds, a smaller diameter is better for turning. Truth is, that overall mass and profile of the tire does play much more into this than the 1" in diameter I would say...:
recommended by Piet some years ago, I changed the rims of my Jota from 18" cast wheels to 18" GSX-R1100 wheels and put BT012SS tires on it that have a V-Shape. That together with the much lighter (though bigger in diameter) brake disks from - I think - a Kawa transformed the bike into almost a flicker... Many have ridden this bike and experienced the difference to their standard bike and were amazed of it's handling. It feels much, much lighter than it really is and is very controllable and stabil.
Meanwhile, the 012SS is not available, so I had to replace it with something similar (BT016?), which gives similarly good handling. I have ridden that combination also on the Track of Spa (see my avatar) where I touched ground with the alternator cover on the 180° right turn (turn 8, Bruxelles). I am heavy and not the best rider, but this combination gives a lot, lot confidence in the bike that I did not have with the original rims and the - at that time "best in class" Metzeler ME tires... Though much wider (150 compared to 130), the handling is so much improved, I could not believe it until I went back to a standard bike years later again for a test ride...
Same on the 1000SFC: I bought 2 1000 SFC in a package some years ago and restored the black "Classic". That bike was original suspension wise (except for the improved fork) and had modern Conti-Tires on it. It did not compare well in terms of handling with my 1000 SFC which has GSX-R-rims, too...