For a 2014+ E63 (wagon, if it matters), What's the widest wheel and tire combo can you run on the front without rubbing, even when the suspension is fully compressed?

Ideally, I'd like to keep the stock 19", though I'd consider 20s. I also would NOT be lowering the car. I simply want more traction on the front.

thanks in advance for any info!

 

so far, widest ive seen is 265/295 on stock rims, but im sure you could go wider, just would take some trial and error in offsets