Why Get a spare tire? Many BMW owners dread the run flat tires that come with the car, while its a no brainer to ditch the run flats and get regular tires, you run into the issue of not having a spare tire. Get the spare and move to regular tires without the thought of driving without a spare...
I hope to never use it but I'd rather be ready.
While I think that their price is reasonable considering the fact that if you try to source tire and rim separately plus the cost of tire to rim mounting , I've access to pretty much brand new 165/70-18 tire size which is part of their kit so I need the rim only.
What I can't figure it out is which BMW steel rim part # they've used to in order to get right offset to clear the big brakes while staying with 72.5mm center bore.
I don't think they sell the rim only and it should be avaliable from dealer as long as I know the right part #.
It seems that similar rims run about $100. This one would probably work although hub adapter is needed (74.1mm to 72.5mm), but still not sure if it will clear the big M5 front brakes.