sure they would fit rather well and I completely agree with that, but in this time and age fitting “rather well” is not flush. And anything over 20mm are “Bolt on” and have no need for extended studs, but he asked what was the max spacer he could run without extending studs so I answered his question.
I had read on other forums that anything up to 8mm is safe, and you see people running 5mm spacers all day on stock studs. But im sure your right so I apologize for the wrong info.
And again about the 17x9 +20, refer to my first comment. That size wheel is considered flush by most peoples standards and having streched tires is just a given. I mean I would consider a 8" +30 wheel to fit rather well and for the most part be flush, But If you head over to zilvia all the fanboys will be like “omg you sunk my battleship”.
Thanks for your concern.