1. Means to correct (Repair/replace): Replaced through BMW cost was bout $650

2. Why you think it cracked (don't know, rough road, etc): It seems like it was an accumulation of stress. I'm pretty careful about avoiding road hazards and it's a recent development so I can't necessarily blame the PO.

3. How did you know it cracked (Tire would not hold air, etc): Slow leak in the tire; one cold morning it was near totally flat.

4. Age of rim (mileage, years, etc): I can only assume that it's original so ~7 years 67k miles.