You wont rub at all, My front wheel could use about 4-5 mm more, so +15 would be dead on, atleast i think. For the rears +10 would be just about be spot on!
I have no rubing what so ever, My camber is -2.5 in the rear and -2.3 right Front and-1.9 left front, I was able to adjust it to -2.5 in the rear with the stock camber arms and i got my toe dead on aswell!
The front wasnt touched, as i dont have adjsutable upper control arms.
Wiggins, Go 305/25R20 in the rear. If i was gonna do it all over again, i woulda went 275/30r20 in the front to keep it closer to stock stagger, but not sure how itll fit.
but go 30525r20, Little wider in the rear and itll look better.
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