New g37 owner. Just got new rims 20x10 (back) and 20x8.5 (front). I am trying to find the right tire size to make my car look flushed (stagger & low profile). Please help

 

Need more info~Coupe or Sedan? And what offsets are your new 20" wheels running? A good starting point would be 245/35/20 front and 275/30/20 back.
But you may be able to go wider depending on the offset, or if you bought real aggressive offset wheels you might be forced to run narrower tires.

 

Yes, a bit more information would be a great help.