mohawky

I am interested in installing 20X9 Rohanna RC-10 wheels and 235/30-20 tires on my 2005 B6 S4. My suspension is stock. The company I am dealing with is advising that they might rub or I may need to roll the fenders. My vehicle came with 235/40-18 tires and I currently have 245/40-18 tires on it. Mathematically the 245s I currently run are 0.3" taller than the stock 235s and the 235/30-20s will only be 0.1" taller. The difference is the new wheels are 9" vs my current 8" which I guess could cause the rub or need to roll fenders. I am waiting to hear what the offset of the wheels are since it is not on website. I was hoping someone has some information that can help me.