My iX came with Goodyear Eagle Touring 255/50R21 tires. They are nice riding M&S tires but I just realized that they are NOT run flats like most other recent BMWs I've owned. Picked up a small screw and the tire deflated quickly (40 pounds to flat) in about 45 minutes. I thought this was worth a "heads up" on this forum in case anyone (like me) had a false sense of security that they could go another 50 miles after getting a tire warning. Since the puncture was in the tread section, my local Discount Tire successfully plugged and patched the damage and I'm apparently "good as new". I carry a supplemental inflator (in addition to the BMW supplied one) which proved to be a savior in getting to a repair shop since I didn't want to use the "goop" that BMW supplies as a tempo patch.