Q60S Help
 

I know I'm in the wrong forum, but the Q60 forums are a little dead cause I guess the car is still new. But I picked up a 2018 Q60 SS, and they currently have terrible run flats on them and I want to switch them out really bad. It's a squared setup with 255/40/19 all around and the rims are 19x9 with I'm not sure of +35mm or +40mm offsets. But my question is what's the best possible tire setup to go staggered on these? or what are the widest I could go all around, just looking for a little poke nothing to major. But I really would love a staggered setup which wouldn't interfere much with the car. I know on the IPL rims I was going 245/40/19 fronts and 275/35/19 in the rears.