I am looking for a Mercedes spare wheel too because of the M-sport brakes. I found one wheel with the tire 155/70R19. However, maybe I didn't take the measurement correctly, but I don't think it will fit in the space under the trunk.
I took the spare wheel from my Audi Q3 (145/80R18) and it didn't go in. I think if I deflate the tire, it will fit (i didn't try too lazy to inflate it after)... which means that I'll need a pump too along with the jack.
Like you, I am not in a rush. I am not going anywhere far. With Montreal weather, I only got flats near the end of the winter or spring with all the potholes.
Along with BMW road assistance, I should get a can in the meantime like you.
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