I have a 2018 e63 4 matic with 265/40/19 fronts and 295/35/19 rears. Ive looked in the drivers door opening, behind the fuel flap and read the manual but can’t find what size winter tyres are correct for this.
I looked into this a last winter and don’t think you can fit anything smaller. I have 20” on my E53 and was looking for 18” as I wanted something with thicker side wall but the smallest I could go down was 19 which was not worth it