Run Flats
 

I was wondering what the largest Run flat tire size is. I cant seem to find anything beyond the 21" runflats BMW uses for their factory upgrades. Are those the largest runflats? Or do they make 22" runflats?

I suspect 21" are the largest RFTs that are made. When going to 22", they are non OEM BMW issue and non RFT.

Cheers,

21" RFT is the largest you'll get. I was in the market for 22" RFTs last year, but after much research, found that they don't make it.
You'll be better off with non-RFT 20" or 22". 21" is not a popular size and tires are pretty costly.

Do you have the spare? My concern is that I dont, and dont want my wife to be stuck when she drives it should something happen. I also dont want her to have to wait the hr+ it usually takes BMW roadside.

We have a spacesaver spare - usable to get where you need to get if the RFTs fail completely.

Cheers,