Looking at Rohana RFX5 and 11 or Stance SF07 for a 2018 black S5 SB. I would like either 19x10 or 20x10 all around. I was thinking 265/35/xx tires. I will not lower the car as I live in the country and have a rock drive. What offset do I need so the new setup does not rub at all? Am I correct on tire size or would a 255 or 275 be a better choice?

Thanks for any help.