I run with RPF1 18'' 9.5 +15 square setup on a 275 tire.
the rear is perfect and the front you will need to run with a lot of camber or narrow tire.
I had to roll my front fender to make sure it doesnt rub !
they clear my AP BBK.
the +38 in 9.5'' didnt clear the caliper
edit;
-2.7 camber