Just changed my tires last week. (need to post pictures).

I have 295/30R19s (Yokohama Advans). I need a 5 or 10mm spacer to keep it from rubbing the upper-inner-forward area of the wheel well at full suspension travel. Otherwise it's fine.

I was also able to put 245/35R18s (same brand and make) on the fronts and could probably go to 255s, but it would rub for sure. Takes full suspension travel now to get small rubbing.

Hope that helps... Cheers!