Just to share the set up that I installed F80 M4 18" forged wheel on E91
Style 513M : F 18"x9J ET29 , R18"x10J ET40
Tire : RE003 F 235/40/18 , R 265/35/18 ( a little stretched )
Spacer : it's no rubbing without any spacer , But I had 10mm for rear and now it's 15mm on rear for more stance looking , all no rubbing.
20mm for rear not test yet but looks OK and suggest no more than 20mm
the suspension is M-sport from stock.
and the spacer set from Burgertuning , excellect surface flatnnes !
FYI thank you.
Front
Rear w/ 15mm space