I replaced mine with Michelin Run Flats - Mercedes MOE
I purchased my 2015 X1 xDrive35i M-Sport as an CPO and it was equipped with the factory-fit Pirelli 18" all-season Run Flats. When it was time to replace those I found some 225/45R-18 MICHELIN PRIMACY MXM4 ZP MOE at a very good price at tirerack_com. Paid lest than $140/tire after rebate; they're not that cheap now.
However, these tires provide a more comfortable ride than the Pirellis, and they are quieter, too (not as much "thumping" from road irregularities). I'm happy with them and would buy them again if I can get them at a reasonable price.
PS - It's a bit confusing navigating the Pirelli SSR (Self-Supporting Run-Flat) vs Michelin ZP (Zero Pressure) vs Mercedes MOE terminology, but near as I can figure these specific Michelin tires have comparable distance/speed capabilities after a puncture to the Pirellis, but also pass Mercedes requirements for MOE ride-quality.
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