Hi , I was after some advise , what is the standard set up of wheels and types for my z4 . I am new to having the car and don't know if I have got the correct set up and the effects of having different wheels . I have got a 2004 se 3.0 car , the wheels that are currently fitted are mv3 which are 18 inch with 235 x 40 tyres . However I do think they should be different front to back and mine aren't . should I get the larger back wheels and will they fit , I am very new to this car and maybe should have done more research before I bought it lol . I do love the car ,just want to make sure I got it set up correctly.any advise pls