They are OEM size. Same rolling diameter as bmw 22 summers. More likely the dealer cant get them in at the price they want, or they are not allowed to as they dont have the BMW approval. What rubbish about damaging transmission. These dealers will feed us so much crap. I’m running 20 inch general grabber AT3 in the winter which also aren’t Bmw approved but they are OEM size. No way will it invalidate your warranty.
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