The only concern one might have with the Bridgestones in 235/50-18 (vice 245/50-18) is the load rating of the 235's. According to tirerack, that size has a load rating of only 97 compared to 100 for the 245's. Technically, the 235's might not be designed for the weight of an X3. I am no engineer, but you might want to ask the folks at Tirerack if this would be an issue.
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