I'm sure people will prove me wrong as soon as I open my big mouth and say this... but if you're running 195/50/15 tires on 15X7- you should be able to get down to +25 w/o fender rolling. +27 would be a safer guide though.
This is assuming you've got decent camber and you're not running tires like Azenis/ Kumho MX, etc, which are wider than their numbers indicate.
This is assuming you've got decent camber and you're not running tires like Azenis/ Kumho MX, etc, which are wider than their numbers indicate.