What's the 3is maximum offset / wheel fitment before it rubs?

I'm a wheel noob not really sure how I can tell if a aftermarket rim will fit?

All depends on your rides height. Stock height? Springs? Coils or Bags? There are some very aggressive fitments out there. I'm super conservative when it comes to offset. Front width no more than 8.5 and rear no more than 9.5 with at least a +38 offset on both. Search through the Build Threads to get some idea of what others are running or just browse through here.

i saw many people are running 9 et 35 and 10.5 et 40 on stock without any issue