OEM Wheel Widths?

[VintageFerrari]

I've just discovered something a bit strange about F06/F10/F12/F13 wheel widths.

In the official BMW pricing guide, the 343M wheels are described as being 20x9.0 and 20x10.0 (Part Nos 36112284450 & 36112284451). The 433M standard GC wheels are described as being 20x9.5 and 20x10.0 (Part Nos 36112283402 & 36112283403).

However, when I phoned the parts dept of my local BMW dealer, their system shows the respective front and rear wheel widths of BOTH the 343M AND 433M styles for the F06 GC/F12/F13 applications as being 20x9.5 (ET31) and 20x10.5 (ET19).

I wonder which of these sources contains the correct information?

{As an interesting aside, for the F10 M5 application the front are rear 343M wheels widths are 1/2" narrower @ 20x9.0 (ET34) and 20x10.0 (ET34), with Part Nos 36112283999 & 36112283401, but possibly with a different Part No (36112283400) for the F10 M5 fronts when equipped with M Carbon Ceramic Brakes? (but still 20x9.0 and ET34)}

[Hunter5179]

This is what I know.

F12/13 M6 wheels - 343M

Front wheels: 20x9.5" ET31
Rear wheels: 20x10" ET19

[VintageFerrari]

Do you know this from having personally measured the wheel widths, or is this just something you've seen/read somewhere?

[Hunter5179]

Originally Posted by VintageFerrari

Do you know this from having personally measured the wheel widths, or is this just something you've seen/read somewhere?

I got it from a BMW resource. I don't remember which. When the F13 M6 first came out.