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BMW X3 are very sensitive to the wheel diameter difference due to its 4 wheel drive design. Smaller spare tire may even damage differential and transfer case.
I found on-line a used wheel rim that matches my car rim style. It was around $100. Most important, it still had stock tire pressure monitor. I want to make sure that even with spare tire TPMS is active. BMW is very good about initializing TPMS with the new tire - you just reset in through the car menu, and then it registers the new sensor in couple of minutes of driving.
I got the same tire for the spare to make sure there is no tire size difference. Spare tire does eat into the trunk area, but it worth it to have it for long travels.
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