My 2018 M550 (purchased as a CPO, which I’m likely to keep for 4 or 5 years) came with non-RFTs, but it was originally equipped with RFTs. As such, I have no spare.
The geniuses at the BMW Genius desk referred me to my local dealer, who was supposed to be “delighted to discuss my retrofit options” with me.
But the dealer said there aren’t any.
They recommended an inflator kit (part 71102333674). I haven’t studied how these work, but on its face it looks like a dubious suggestion.
I did find this aftermarket spare tire kit, although I haven’t been able to figure out how to lift up the carpeted trunk floor to access what’s presumably the space underneath where the kit would go.
If you’ve solved the “missing spare” problem in this generation of 5 Series I’d appreciate hearing how you did it.
I have limited appetite to paw through BMW forums.