here i am showing you some of my experience of 19inch wheel on f48...
BBS CHR F:8.5 ET40 245-40-19 R:9.5 ET45 275-35-19
REAR tire need to change to 255-35-19 to not hit the wheel arch...
BBS LM F/R:8.5 ET32 235-40-19
VORSTEINER VFF103 F:8.5 ET45+5mm spacer 235-40-19 R:9.5 ET46 265-35-19
I am now thinking 20inch 8.5J ET38
