Mobility kits mess up both the tire and the wheel, shops hate working with wheels covered in the mobility goo and getting it completely removed from a wheel can be tough, leading to challenges with balancing that wheel.
I've gone 9 years with no spare and no run flats, but my M Coupe came with lifetime roadside for tires. I'd guess that the 1er doesn't get that benefit if you remove the run flats, but AAA is still cheaper than buying a spare if you're concerned about it.
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