Originally Posted by ard

Yes, that is PRECISELY what I am saying.

Tell you what, go to tirerack, look up your car. Select tires for "OE"..look at each of the OE tires, and write down the DIAMETER of the OE 19", the OE 20" etc...all of them will be the same diameter.

Why?

BECAUSE BMW DOESNT WANT TO HAVE TO RECALIBRATE CARS AS THEY ARE BUILT, ordered with different tire/wheel combos!

So the OE donut spare will work on and OE wheel size.

And I do have and idea what BMW recommends: the OE donut spare