close, but...
The tire sizes you selected are within a couple tenths of one another (overall diameter), so should be OK (not sure of the "official" BMW tolerance), but main concern is that the 315 needs at least a 10.5" wide wheel per the manufacturers. Wouldn't be the safest application.....
You didn't include the year and version of your X5, so I'm not sure if the 315 is OK or not (width wise).
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