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There is no problem switching from 18" to 17" tire/wheel combination. However, there are two considerations: that the 17" set has the same load rating and the overall diameter of both sets are relatively the same. For example, if one changes out 245/50-18 summer tires with 225/60-17 winter ones, then all is fine - load ratings and diameters are the same. Also, the winter set, will be narrower as preferred for snow. But 225/45-17 tires are not even close to 245/60-17 tires in either diameter or load rating. One can ignore the speedometer error, but a tire of insufficient load rating may be unsafe, as the X3 is too heavy for the smaller tires.
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